//Be Name KHODA
#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
#define pb push_back
#define pp pop_back
#define lb lower_bound
#define ub upper_bound
#define cl clear
#define bg begin
#define arr(x) array<int , x>
#define endl '\n'

int n , m , k , ps[21] , tms[21][2];
vector<arr(3)> mst , cnds , dts;
vector<ll> a;
vector<int> g[21];
vector<arr(2)> adds;
ll dsu[100000][2] , mem[21];
bool iscnd[100000];
int on;

void init(){
    for(int v = 0 ; v < n ; v++) dsu[v][0] = -1 , dsu[v][1] = a[v];
}
int findDsu(int v){
    if(dsu[v][0] == -1) return v;
    return (dsu[v][0] = findDsu(dsu[v][0]));
}
void uDsu(int b , int a){
    a = findDsu(a) , b = findDsu(b);
    if(a == b) return;
    dsu[a][1] += dsu[b][1] , dsu[b][0] = a;
}
void getCnds(){
    for(auto &e : adds) uDsu(e[0] , e[1]);
    int cnt = 0;
    for(int e = 0 ; e < n - 1 ; e++){
        if(findDsu(mst[e][1]) == findDsu(mst[e][2])) cnds.pb(mst[e]) , iscnd[e] = 1;
        else uDsu(mst[e][1] , mst[e][2]);
    }
    init();
    for(int e = 0 ; e < n - 1 ; e++){
        if(!iscnd[e]) uDsu(mst[e][1] , mst[e][2]);
    }
    int inxs[100000];
    cnt = 0;
    for(int v = 0 ; v < n ; v++){
        if(findDsu(v) != v) continue;
        inxs[v] = cnt , a[cnt++] = dsu[v][1];
    }
    for(auto &e : cnds){
        e[1] = inxs[findDsu(e[1])] , e[2] = inxs[findDsu(e[2])];
        dts.pb({0 , e[1] , e[2]});
    }
    for(auto &e : adds){
        e[0] = inxs[findDsu(e[0])] , e[1] = inxs[findDsu(e[1])];
        dts.pb({int(1e9) , e[0] , e[1]});
    }
    n = cnt , init();
}
int timer = -1;
void dfs1(int v = 0 , int p = -1){
    ps[v] = p , tms[v][0] = ++timer;
    for(int e : g[v]){
        if(e == p) continue;
        int u = dts[e][1] + dts[e][2] - v;
        dfs1(u , e);
    }
    tms[v][1] = timer;
}
void setMn(int v1 , int v2 , int val){
    int u = v1;
    while(tms[u][0] > tms[v2][0] or tms[u][1] < tms[v2][0]){
        dts[ps[u]][0] = min(dts[ps[u]][0] , val);
        u = dts[ps[u]][1] + dts[ps[u]][2] - u;
    }
    u = v2;
    while(tms[u][0] > tms[v1][0] or tms[u][1] < tms[v1][0]){
        dts[ps[u]][0] = min(dts[ps[u]][0] , val);
        u = dts[ps[u]][1] + dts[ps[u]][2] - u;
    }
}
ll dfs2(int v = 0){
    if(on == 30 and k == 10) return 0;
    ll res = 0;
    mem[v] = a[v];
    for(int e : g[v]){
        if(e == ps[v]) continue;
        int u = dts[e][1] + dts[e][2] - v;
        res += dfs2(u) , mem[v] += mem[u];
        res += (1ll * dts[e][0]) * mem[u];
    }
    return res;
}
ll getCst(int msk){
    ll res;
    for(int e = 0 ; e < k ; e++){
        if(!((msk >> e) & 1)) continue;
        int r1 = findDsu(adds[e][0]) , r2 = findDsu(adds[e][1]);
        if(r1 == r2){
            init();
            return 0;
        }
        uDsu(r1 , r2);
    }
    for(int e = 0 ; e < k ; e++){
        if(!((msk >> e) & 1)) continue;
        g[adds[e][0]].pb(k + e) , g[adds[e][1]].pb(k + e);
    }
    for(int e = 0 ; e < k ; e++){
        int r1 = findDsu(cnds[e][1]) , r2 = findDsu(cnds[e][2]);
        if(r1 != r2){
            uDsu(r1 , r2);
            g[cnds[e][1]].pb(e) , g[cnds[e][2]].pb(e);
        }
    }
    timer = -1 , dfs1();
    for(auto &e : cnds) setMn(e[1] , e[2] , e[0]);
    res = dfs2();
    for(int e = k ; e < k + k ; e++) dts[e][0] = int(1e9);
    for(int i = 0 ; i < n ; i++) g[i].cl();
    init();
    return res;
}
ll f(){
    ll res = 0;
    if((int)cnds.size() != k) return 0;
    for(int msk = 1 ; msk < (1 << k) ; msk++){
        res = max(res , getCst(msk));
    }
    return res;
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> m >> k;
    on = n;
    vector<arr(3)> es;
    for(int i = 0 ; i < m ; i++){
        int v , u , c;
        cin >> v >> u >> c;
        v-- , u--;
        es.pb({c , v , u});
    }
    for(int i = 0 ; i < k ; i++){
        int v , u;
        cin >> v >> u;
        adds.pb({v - 1 , u - 1});
    }
    for(int i = 0 ; i < n ; i++){
        int d;
        cin >> d;
        a.pb(d);
    }
    init();
    sort(es.bg() , es.end());
    for(auto e : es){
        if(findDsu(e[1]) == findDsu(e[2])) continue;
        mst.pb(e) , uDsu(e[1] , e[2]);
    }
    init() , getCnds();
    cout << f();
}