#include <bits/stdc++.h>
using namespace std;

#ifndef LOCAL_TEST
#pragma GCC target ("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#endif // LOCAL_TEST

using ll = long long;
using i128 = __int128_t;
using str = string;
using pii = pair<int, int>; using pll = pair<ll, ll>;
using vi = vector<int>;  using vvi = vector<vi>; using vvvi = vector<vvi>;
using vl = vector<ll>;  using vvl = vector<vl>; using vvvl = vector<vvl>;
using vb = vector<bool>; using vvb = vector<vb>; using vvvb = vector<vvb>;
using vc = vector<char>; using vvc = vector<vc>; using vvvc = vector<vvc>;
using vd = vector<double>; using vvd = vector<vd>; using vvvd = vector<vvd>;
using vs = vector<string>; using vvs = vector<vector<string>>; using vvvs = vector<vector<vector<string>>>;

template<typename T> vector<vector<T>> vv(int h, int w, T val = T()) { return vector(h, vector<T>(w, val)); }
template<typename T> vector<vector<vector<T>>> vvv(int h1, int h2, int h3, T val = T()) { return vector(h1, vector(h2, vector<T>(h3, val))); }
template<typename T> vector<vector<vector<vector<T>>>> vvvv(int h1, int h2, int h3, int h4, T val = T()) { return vector(h1, vector(h2, vector(h3, vector<T>(h4, val)))); }

template <class T> using priority_queue_min = priority_queue<T, vector<T>, greater<T>>;

constexpr double PI = 3.14159265358979323;
constexpr int INF = 100100111; constexpr ll INFL = 3300300300300300491LL;
float EPS = 1e-8; double EPSL = 1e-10;


struct Nyan { Nyan() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(18); } } nyan;

#define all(a) (a).begin(), (a).end()
#define len(x) ((ll)(x).size())
#define sz(x) ((ll)(x).size())
#define rep1(n) for(ll dummy_iter = 0LL; dummy_iter < n; ++dummy_iter) // 0,1,...,n-1
#define rep2(i, n) for(ll i = 0LL, i##_counter = 0LL; i##_counter < ll(n); ++(i##_counter), (i) = i##_counter) // i=0,1,...,n-1
#define rep3(i, s, t) for(ll i = ll(s), i##_counter = ll(s); i##_counter < ll(t); ++(i##_counter), (i) = (i##_counter)) // i=s,s+1,...,t-1
#define rep4(i, s, t, step) for(ll i##_counter = step > 0 ? ll(s) : -ll(s), i##_end = step > 0 ? ll(t) : -ll(t), i##_step = abs(step), i = ll(s); i##_counter < i##_end; i##_counter += i##_step, i = step > 0 ? i##_counter : -i##_counter) // i=s,s+step,...,<t
#define overload4(a, b, c, d, e, ...) e
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define repe(a, v) for(auto&& a : (v)) // iterate over all elements in v
#define repc(a, v) for(const auto& a : (v)) // iterate over all elements in v
#define smod(n, m) ((((n) % (m)) + (m)) % (m))
#define sdiv(n, m) (((n) - smod(n, m)) / (m))
#define uniq(a) {sort(all(a)); (a).erase(unique(all(a)), (a).end());}

int Yes(bool b=true) { cout << (b ? "Yes\n" : "No\n"); return 0; };
int YES(bool b=true) { cout << (b ? "YES\n" : "NO\n"); return 0; };
int No(bool b=true) {return Yes(!b);};
int NO(bool b=true) {return YES(!b);};

template<typename T, size_t N> T max(array<T, N>& a) { return *max_element(all(a)); };
template<typename T, size_t N> T min(array<T, N>& a) { return *min_element(all(a)); };
template<typename T> T max(vector<T>& a) { return *max_element(all(a)); };
template<typename T> T min(vector<T>& a) { return *min_element(all(a)); };
template<typename T> vector<T> vec_slice(const vector<T>& a, int l, int r) { vector<T> rev; rep(i, l, r) rev.push_back(a[i]); return rev; };
template<typename T> vector<T> vec_slice(const vector<T>&& a, int l, int r) { vector<T> rev; rep(i, l, r) rev.push_back(a[i]); return rev; };
template<typename T> T sum(vector<T>& a, T zero = T(0)) { T rev = zero; rep(i, sz(a)) rev += a[i]; return rev; };
template<typename T> T sum(vector<T>&& a, T zero = T(0)) { T rev = zero; rep(i, sz(a)) rev += a[i]; return rev; };


template <class T> inline vector<T>& operator--(vector<T>& v) { repe(x, v) --x; return v; }
template <class T> inline vector<T>& operator++(vector<T>& v) { repe(x, v) ++x; return v; }

ll powll(ll a, ll n) {
    ll res = 1;
    while (n > 0) {
        if (n & 1) res = (res * a);
        if (n > 1) a = (a * a);
        n >>= 1;
    }
    return res;
}
ll powm32(ll a, ll n, int mod) {
    ll res = 1;
    while (n > 0) {
        if (n & 1) res = (res * a) % mod;
        if (n > 1) a = (a * a) % mod;
        n >>= 1;
    }
    return res % mod;
}
ll powm64(i128 a,i128 n,ll mod){
    i128 res = 1;
    while (n > 0) {
        if (n & 1) res = (res * a) % mod;
        if (n > 1) a = (a * a) % mod;
        n >>= 1;
    }
    return res % mod;
}
ll sqrtll(ll x) {
    assert(x >= 0);
    ll rev = sqrt(x);
    while(rev * rev > x) --rev;
    while((rev+1) * (rev+1)<=x) ++rev;
    return rev;
}

template <class T> inline bool chmax(T& M, const T& x) { if (M < x) { M = x; return true; } return false; }
template <class T> inline bool chmin(T& m, const T& x) { if (m > x) { m = x; return true; } return false; }

template <class T, class U> inline istream& operator>>(istream& is, pair<T, U>& p);
template <class T> inline istream& operator>>(istream& is, vector<T>& v);
template <class T, class U> inline ostream& operator<<(ostream& os, const pair<T, U>& p);
template <class T> inline ostream& operator<<(ostream& os, const vector<T>& v);
template <typename T, typename S> ostream &operator<<(ostream &os, const map<T, S> &mp);
template <typename T> ostream &operator<<(ostream &os, const set<T> &st);
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &st);
template <typename T> ostream &operator<<(ostream &os, const unordered_set<T> &st);
template <typename T> ostream &operator<<(ostream &os, deque<T> q);
template <class T, class Container, class Compare> ostream &operator<<(ostream &os, priority_queue<T, Container, Compare> pq);

template <class T, class U> inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template <class T> inline istream& operator>>(istream& is, vector<T>& v) { repe(x, v) is >> x; return is; }
template <class T, class U> inline ostream& operator<<(ostream& os, const pair<T, U>& p) { os << p.first << " " << p.second; return os; }
template <class T> inline ostream& operator<<(ostream& os, const vector<T>& v) { rep(i, sz(v)) { os << v.at(i); if (i != sz(v) - 1) os << " "; } return os; }
template <typename T, typename S> ostream &operator<<(ostream &os, const map<T, S> &mp) { for (auto &[key, val] : mp) { os << key << ":" << val << " "; } return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &st) { auto itr = st.begin(); for (int i = 0; i < (int)st.size(); i++) { os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &st) { auto itr = st.begin(); for (int i = 0; i < (int)st.size(); i++) { os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_set<T> &st) { ll cnt = 0; for (auto &e : st) { os << e << (++cnt != (int)st.size() ? " " : ""); } return os; }
template <typename T> ostream &operator<<(ostream &os, deque<T> q) { while (q.size()) { os << q.front(); q.pop_front(); if (q.size()) os << " "; } return os; }
template <class T, class Container, class Compare> ostream &operator<<(ostream &os, priority_queue<T, Container, Compare> pq) { while (pq.size()) { os << pq.top() << " "; pq.pop(); } return os; }
#define dout(x) cout << fixed << setprecision(10) << x << endl

#define read1(a) cin >> a;
#define read2(a, b) cin >> a >> b;
#define read3(a, b, c) cin >> a >> b >> c;
#define read4(a, b, c, d) cin >> a >> b >> c >> d;
#define read5(a, b, c, d, e) cin >> a >> b >> c >> d >> e;
#define read6(a, b, c, d, e, f) cin >> a >> b >> c >> d >> e >> f;
#define read7(a, b, c, d, e, f, g) cin >> a >> b >> c >> d >> e >> f >> g;
#define read8(a, b, c, d, e, f, g, h) cin >> a >> b >> c >> d >> e >> f >> g >> h;

#define overload_read(a, b, c, d, e, f, g, h, i, ...) i
#define read(...) overload_read(__VA_ARGS__,read8,read7,read6,read5,read4,read3,read2,read1)(__VA_ARGS__)

#ifdef LOCAL_TEST
#define inner_output1(a) cout << a << endl;cerr << "[OUTPUT #" << __LINE__ << "] " << a << endl;
#define inner_output2(a, b) cout << a << " " << b << endl;cerr << "[OUTPUT #" << __LINE__ << "] " << a << " " <<b << endl;
#define inner_output3(a, b, c) cout << a << " " << b << " " << c << endl;cerr << "[OUTPUT #" << __LINE__ << "] " << a << " " << b << " " << c << endl;
#define inner_output4(a, b, c, d) cout << a << " " << b << " " << c << " " << d << endl;cerr << "[OUTPUT #" << __LINE__ << "] " << a << " " << b << " " << c << " " << d << endl;
#define inner_output5(a, b, c, d, e) cout << a << " " << b << " " << c << " " << d << " " << e << endl;cerr << "[OUTPUT #" << __LINE__ << "] " << a << " " << b << " " << c << " " << d << " " << e << endl;
#define inner_output6(a, b, c, d, e, f) cout << a << " " << b << " " << c << " " << d << " " << e << " " << f << endl;cerr << "[OUTPUT #" << __LINE__ << "] " << a << " " << b << " " << c << " " << d << " " << e << " " << f << endl;
#define inner_output7(a, b, c, d, e, f, g) cout << a << " " << b << " " << c << " " << d << " " << e << " " << f << " " << g << endl;cerr << "[OUTPUT #" << __LINE__ << "] " << a << " " << b << " " << c << " " << d << " " << e << " " << f << " " << g << endl;
#define inner_output8(a, b, c, d, e, f, g, h) cout << a << " " << b << " " << c << " " << d << " " << e << " " << f << " " << g << " " << h << endl;cerr << "[OUTPUT #" << __LINE__ << "] " << a << " " << b << " " << c << " " << d << " " << e << " " << f << " " << g << " " << h << endl;

#else

#define inner_output1(a) cout << a << endl;
#define inner_output2(a, b) cout << a << " " << b << endl;
#define inner_output3(a, b, c) cout << a << " " << b << " " << c << endl;
#define inner_output4(a, b, c, d) cout << a << " " << b << " " << c << " " << d << endl;
#define inner_output5(a, b, c, d, e) cout << a << " " << b << " " << c << " " << d << " " << e << endl;
#define inner_output6(a, b, c, d, e, f) cout << a << " " << b << " " << c << " " << d << " " << e << " " << f << endl;
#define inner_output7(a, b, c, d, e, f, g) cout << a << " " << b << " " << c << " " << d << " " << e << " " << f << " " << g << endl;
#define inner_output8(a, b, c, d, e, f, g, h) cout << a << " " << b << " " << c << " " << d << " " << e << " " << f << " " << g << " " << h << endl;

#endif
#define overload_inner_output(a, b, c, d, e, f, g, h, i, ...) i
#define out(...) overload_inner_output(__VA_ARGS__,inner_output8,inner_output7,inner_output6,inner_output5,inner_output4,inner_output3,inner_output2,inner_output1)(__VA_ARGS__)

#define ii(...) ll __VA_ARGS__; read(__VA_ARGS__)
#define si(...) string __VA_ARGS__; read(__VA_ARGS__)
#define ci(...) char __VA_ARGS__; read(__VA_ARGS__)
#define di(...) double __VA_ARGS__; read(__VA_ARGS__)
#define li(name,size); vector<ll> name(size); read(name)
#define lli(name,H,W); vector name(H,vector<ll>(W));rep(i,H) cin >> name[i];


#ifdef LOCAL_TEST
#define inner_debug1(a) cerr << "[DEBUG#" << __LINE__ << "] " << #a << " = " << a << endl;
#define inner_debug2(a, b) cerr << "[DEBUG#" << __LINE__ << "] "<< #a << " = " << a << ", " << #b << " = " << b << endl;
#define inner_debug3(a, b, c) cerr << "[DEBUG#" << __LINE__ << "] "<< #a << " = " << a << ", " << #b << " = " << b << ", " << #c << " = " << c << endl;
#define inner_debug4(a, b, c, d) cerr << "[DEBUG#" << __LINE__ << "] "<< #a << " = " << a << ", " << #b << " = " << b << ", " << #c << " = " << c << ", " << #d << " = " << d << endl;
#define inner_debug5(a, b, c, d, e) cerr << "[DEBUG#" << __LINE__ << "] "<< #a << " = " << a << ", " << #b << " = " << b << ", " << #c << " = " << c << ", " << #d << " = " << d << ", " << #e << " = " << e << endl;
#define inner_debug6(a, b, c, d, e, f) cerr << "[DEBUG#" << __LINE__ << "] "<< #a << " = " << a << ", " << #b << " = " << b << ", " << #c << " = " << c << ", " << #d << " = " << d << ", " << #e << " = " << e << ", " << #f << " = " << f << endl;
#define inner_debug7(a, b, c, d, e, f, g) cerr << "[DEBUG#" << __LINE__ << "] "<< #a << " = " << a << ", " << #b << " = " << b << ", " << #c << " = " << c << ", " << #d << " = " << d << ", " << #e << " = " << e << ", " << #f << " = " << f << ", " << #g << " = " << g << endl;
#define inner_debug8(a, b, c, d, e, f, g, h) cerr << "[DEBUG#" << __LINE__ << "] "<< #a << " = " << a << ", " << #b << " = " << b << ", " << #c << " = " << c << ", " << #d << " = " << d << ", " << #e << " = " << e << ", " << #f << " = " << f << ", " << #g << " = " << g << ", " << #h << " = " << h << endl;

#define overload_inner_debug(a, b, c, d, e, f, g, h, i, ...) i
#define debug(...) overload_inner_debug(__VA_ARGS__,inner_debug8,inner_debug7,inner_debug6,inner_debug5,inner_debug4,inner_debug3,inner_debug2,inner_debug1)(__VA_ARGS__)

#else
#define debug(...);
#endif // LOCAL_TEST


inline ll ctz(ll x) { return __builtin_ctzll(x);}
inline ll clz(ll x) { return __builtin_clzll(x);}
inline ll popcount(ll x) { return __builtin_popcountll(x);}
inline bool inrange(ll x, ll a, ll b) { return a <= x && x < b; }
template <typename T> inline ll findll(vector<T>& v, T x) { auto tmp = find(all(v), x);if(tmp == v.end()){return -1;}else{return distance(v.begin(),tmp); }}
inline ll findll(string& s, char x) { auto tmp = find(all(s), x);if(tmp == s.end()){return -1;}else{return distance(s.begin(),tmp); }}
inline ll ceildiv(ll x,ll y){return (x+y-1)/y;}


#define allit(a,pred) [&]{repc(it,a){if(!(pred)) return false;}return true;}()
#define anyit(a,pred) [&]{repc(it,a){if((pred)) return true;}return false;}()

#define mapit(a, pred) ([&]() { \
    decltype(a)::value_type it; \
    vector<decltype(pred)> result_mapit(a.size()); \
    rep(idx,a.size()){\
        decltype(a)::value_type& it = a[idx];\
        result_mapit[idx] = pred;\
    }\
    return result_mapit; \
})()

#define filterit(a, pred) ([&]() { \
    decltype(a) result_filterit; \
    rep(idx,a.size()){\
        decltype(a)::value_type& it = a[idx];\
        if(pred){\
            result_filterit.push_back(it);\
        }\
    }\
    return result_filterit; \
})()

#define applyit(a, pred) { \
    rep(idx,a.size()){\
        decltype(a)::value_type& it = a[idx];\
        a[idx] = pred;\
    }\
}

#define countit(a, pred) ([&]() { \
    ll result_countit = 0; \
    rep(idx,a.size()){\
        decltype(a)::value_type& it = a[idx];\
        if(pred){\
            result_countit++;\
        }\
    }\
    return result_countit; \
})()

#define sortByIt(a,pred) {\
    sort(all(a),[&](const decltype(a)::value_type& left_value, const decltype(a)::value_type& right_value){auto it = left_value;auto x_value = pred;it = right_value;auto y_value = pred;return x_value<y_value;});\
}

ll minIndex(vector<ll>& a) {
    ll minIndex = 0;
    rep(i, 1, sz(a)) {
        if (a[i] < a[minIndex]) {
            minIndex = i;
        }
    }
    return minIndex;
}

ll maxIndex(vector<ll>& a) {
    ll maxIndex = 0;
    rep(i, 1, sz(a)) {
        if (a[i] > a[maxIndex]) {
            maxIndex = i;
        }
    }
    return maxIndex;
}

template<typename T> vector<T> sorted(vector<T> X){
    sort(all(X));
    return X;
}

vector<string> split(const string& s,char c){
    vector<string> res;
    res.push_back("");
    repc(a,s){
        if(a==c){
            res.push_back("");
        }else{
            res.back() += a;
        }
    }
    return res;
}

#include <algorithm>
#include <cassert>
#include <limits>
#include <queue>
#include <vector>


#include <vector>

namespace atcoder {

namespace internal {

template <class T> struct simple_queue {
    std::vector<T> payload;
    int pos = 0;
    void reserve(int n) { payload.reserve(n); }
    int size() const { return int(payload.size()) - pos; }
    bool empty() const { return pos == int(payload.size()); }
    void push(const T& t) { payload.push_back(t); }
    T& front() { return payload[pos]; }
    void clear() {
        payload.clear();
        pos = 0;
    }
    void pop() { pos++; }
};

}  // namespace internal

}  // namespace atcoder


namespace atcoder {

template <class Cap> struct mf_graph {
  public:
    mf_graph() : _n(0) {}
    explicit mf_graph(int n) : _n(n), g(n) {}

    int add_edge(int from, int to, Cap cap) {
        assert(0 <= from && from < _n);
        assert(0 <= to && to < _n);
        assert(0 <= cap);
        int m = int(pos.size());
        pos.push_back({from, int(g[from].size())});
        int from_id = int(g[from].size());
        int to_id = int(g[to].size());
        if (from == to) to_id++;
        g[from].push_back(_edge{to, to_id, cap});
        g[to].push_back(_edge{from, from_id, 0});
        return m;
    }

    struct edge {
        int from, to;
        Cap cap, flow;
    };

    edge get_edge(int i) {
        int m = int(pos.size());
        assert(0 <= i && i < m);
        auto _e = g[pos[i].first][pos[i].second];
        auto _re = g[_e.to][_e.rev];
        return edge{pos[i].first, _e.to, _e.cap + _re.cap, _re.cap};
    }
    std::vector<edge> edges() {
        int m = int(pos.size());
        std::vector<edge> result;
        for (int i = 0; i < m; i++) {
            result.push_back(get_edge(i));
        }
        return result;
    }
    void change_edge(int i, Cap new_cap, Cap new_flow) {
        int m = int(pos.size());
        assert(0 <= i && i < m);
        assert(0 <= new_flow && new_flow <= new_cap);
        auto& _e = g[pos[i].first][pos[i].second];
        auto& _re = g[_e.to][_e.rev];
        _e.cap = new_cap - new_flow;
        _re.cap = new_flow;
    }

    Cap flow(int s, int t) {
        return flow(s, t, std::numeric_limits<Cap>::max());
    }
    Cap flow(int s, int t, Cap flow_limit) {
        assert(0 <= s && s < _n);
        assert(0 <= t && t < _n);
        assert(s != t);

        std::vector<int> level(_n), iter(_n);
        internal::simple_queue<int> que;

        auto bfs = [&]() {
            std::fill(level.begin(), level.end(), -1);
            level[s] = 0;
            que.clear();
            que.push(s);
            while (!que.empty()) {
                int v = que.front();
                que.pop();
                for (auto e : g[v]) {
                    if (e.cap == 0 || level[e.to] >= 0) continue;
                    level[e.to] = level[v] + 1;
                    if (e.to == t) return;
                    que.push(e.to);
                }
            }
        };
        auto dfs = [&](auto self, int v, Cap up) {
            if (v == s) return up;
            Cap res = 0;
            int level_v = level[v];
            for (int& i = iter[v]; i < int(g[v].size()); i++) {
                _edge& e = g[v][i];
                if (level_v <= level[e.to] || g[e.to][e.rev].cap == 0) continue;
                Cap d =
                    self(self, e.to, std::min(up - res, g[e.to][e.rev].cap));
                if (d <= 0) continue;
                g[v][i].cap += d;
                g[e.to][e.rev].cap -= d;
                res += d;
                if (res == up) return res;
            }
            level[v] = _n;
            return res;
        };

        Cap flow = 0;
        while (flow < flow_limit) {
            bfs();
            if (level[t] == -1) break;
            std::fill(iter.begin(), iter.end(), 0);
            Cap f = dfs(dfs, t, flow_limit - flow);
            if (!f) break;
            flow += f;
        }
        return flow;
    }

    std::vector<bool> min_cut(int s) {
        std::vector<bool> visited(_n);
        internal::simple_queue<int> que;
        que.push(s);
        while (!que.empty()) {
            int p = que.front();
            que.pop();
            visited[p] = true;
            for (auto e : g[p]) {
                if (e.cap && !visited[e.to]) {
                    visited[e.to] = true;
                    que.push(e.to);
                }
            }
        }
        return visited;
    }

  private:
    int _n;
    struct _edge {
        int to, rev;
        Cap cap;
    };
    std::vector<std::pair<int, int>> pos;
    std::vector<std::vector<_edge>> g;
};

}  // namespace atcoder


int main(){
    ii(N,M);
    li(A,N-1);
    li(B,N);
    li(C,N-1);

    atcoder::mf_graph<ll> g((N)+2);
    ll s = N;
    ll t = N+1;
    rep(i,N-1){
        g.add_edge(s,i+1,A[i]);
        g.add_edge(i+1,t,C[i]);
    }
    rep(i,1,N){
        g.add_edge(i,i+1,B[i]);
        g.add_edge(i+1,i,B[i]);
    }
    g.add_edge(s,0,0);
    g.add_edge(0,t,B[0]);
    g.add_edge(s,N-1,B[N-1]);
    g.add_edge(N-1,t,0);

    rep(M){
        ii(i,j,c);
        g.add_edge(j-1,i-1,c);
    }
    out(g.flow(s,t));
}