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

typedef unsigned uint;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vpii;
typedef complex<double> cpx;
template <typename T> using minPq = priority_queue<T, vector<T>, greater<T>>;
#define ms(a, x) memset(a, x, sizeof(a))
#define pb push_back
#define fs first
#define sn second
#define ALL(v) begin(v), end(v)
#define SZ(v) ((int) (v).size())
#define lbv(v, x) (lower_bound(ALL(v), x) - (v).begin())
#define ubv(v, x) (upper_bound(ALL(v), x) - (v).begin())
template <typename T> inline void UNIQUE(vector<T> &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());}
const int INF = 0x3f3f3f3f;
const ll LLINF = 0x3f3f3f3f3f3f3f3f;
const double PI = acos(-1);
#define FR(i, n) for(int i = 0; i < (n); i++)
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define FORR(i, a, b) for(int i = (a); i >= (b); i--)
#define dbg(x) {cerr << #x << ' ' << x << endl;}
#define dbgArr(arr, n) {cerr << #arr; FR(_i, n) cerr << ' ' << (arr)[_i]; cerr << endl;}

template <typename T, typename U>
ostream& operator<<(ostream &os, pair<T, U> p){
    return os << "(" << p.fs << ", " << p.sn << ")";
}

const int MN = 305;
const int MV = MN*3;

template <typename T, int MSZ>
struct Dinic {
    const T TINF = INF;
    struct Edge {
        int node, rev;
        T cap;
        bool real;
    };

    int s, t;
    vector<Edge> adjList[MSZ];
    int dist[MSZ];
    int nxt[MSZ];

    void addEdge(int a, int b, T c){
        adjList[a].pb({b, SZ(adjList[b]), c, true});
        adjList[b].pb({a, SZ(adjList[a])-1, 0, false});
    }

    void rmEdge(int a, int b){
        adjList[a].pop_back();
        adjList[b].pop_back();
    }

    void reset(){
        FR(i, MSZ) for(Edge &e : adjList[i]) if(!e.real) adjList[e.node][e.rev].cap += e.cap, e.cap = 0;
    }

    T dfs(int n1, T f){
        if(f == 0 || n1 == t) return f;
        T pushed = 0;
        while(nxt[n1] < SZ(adjList[n1])){
            Edge &e = adjList[n1][nxt[n1]];
            int n2 = e.node;
            if(dist[n1] < dist[n2]){
                T nf = dfs(n2, min(f, e.cap));
                e.cap -= nf;
                adjList[n2][e.rev].cap += nf;
                pushed += nf;
                f -= nf;
                if(f == 0) break;
            }
            nxt[n1]++;
        }
        return pushed;
    }

    T maxFlow(int inS, int inT){
        s = inS; t = inT;
        T f = 0;
        while(true){
            ms(nxt, 0);
            ms(dist, -1);
            dist[s] = 0;
            queue<int> qu;
            qu.push(s);

            while(!qu.empty()){
                int n1 = qu.front(); qu.pop();
                if(n1 == t) break;
                for(Edge e : adjList[n1]){
                    int n2 = e.node;
                    if(e.cap == 0 || dist[n2] != -1) continue;
                    dist[n2] = dist[n1] + 1;
                    qu.push(n2);
                }
            }

            if(dist[t] == -1) return f;
            f += dfs(s, TINF);
        }
    }
};

int n, m, g;
int dsu[MN];
pair<int, pii> allEdges[MN*MN];
vector<pair<int, pii>> edges;
bool inAns[MN];
Dinic<int, MV> dinic;

int find(int a){
    return dsu[a] < 0 ? a : dsu[a] = find(dsu[a]);
}

void kruskal(){
    sort(allEdges, allEdges + m);

    /*edges = vector<pair<int, pii>>(allEdges, allEdges + m);
    return;*/

    ms(dsu, -1);
    FR(i, m){
        auto [c, p] = allEdges[i];
        auto [a, b] = p;
        a = find(a), b = find(b);
        if(a != b){
            dsu[b] = a;
            edges.pb(allEdges[i]);
        }
    }
}

bool check(){
    ms(dsu, -1);
    FR(i, SZ(edges)) if(inAns[i]){
        auto [a, b] = edges[i].sn;
        a = find(a), b = find(b);
        if(a != b) dsu[b] = a;
    }

    int numRoot = 0;
    FR(i, n) numRoot += dsu[i] < 0;

    FR(i, n) dinic.addEdge(n+i, n+n+find(i), 1);
    int f = dinic.maxFlow(MV-2, MV-1);
    dinic.reset();
    FR(i, n) dinic.rmEdge(n+i, n+n+find(i));

    //dbgArr(inAns, SZ(edges));
    //cerr << f << ' ' << numRoot << endl;

    assert(f <= numRoot);
    return f == numRoot;
}

int main(){
    cin.sync_with_stdio(0); cin.tie(0);
    cin >> n >> m >> g;
    FR(i, m){
        int a, b, c;
        cin >> a >> b >> c;
        a--; b--;
        allEdges[i] = {c, {a, b}};
    }
    kruskal();
    //cerr << "a" << endl;

    FR(i, g){
        int k; cin >> k;
        FR(j, k){
            int a; cin >> a; a--;
            dinic.addEdge(i, n+a, 1);
        }
    }
    FR(i, n) dinic.addEdge(MV-2, i, 1);
    FR(i, n) dinic.addEdge(n+n+i, MV-1, 1);

    FR(i, n) dinic.addEdge(n+i, n+n+i, 1);
    if(dinic.maxFlow(MV-2, MV-1) != g) return !printf("-1\n");
    dinic.reset();
    FR(i, n) dinic.rmEdge(n+i, n+n+i);

    //dbgArr(edges, SZ(edges));

    int ans = 0;
    fill_n(inAns, SZ(edges), true);
    FORR(i, SZ(edges)-1, 0){
        inAns[i] = false;
        if(!check()) inAns[i] = true, ans += edges[i].fs;
    }
    //dbgArr(inAns, SZ(edges));
    cout << ans << '\n';
}