#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int MAX = 3e5 + 5;
int n, m, k;
struct Edges{
int u, v, w;
} MST[MAX], SE[MAX];
int c[MAX];
vector <int> g[MAX];
int weight[MAX], par[MAX], h[MAX];
int sz[MAX];
int lab[MAX];
int find(int x){
return lab[x] < 0 ? x : lab[x] = find(lab[x]);
}
bool joint(int u, int v){
int x = find(u), y = find(v);
if(x == y) return false;
if(lab[x] > lab[y]) swap(x, y);
lab[x]+= lab[y];
lab[y] = x;
return true;
}
void reset_dsu(){
memset(lab, - 1, sizeof lab);
}
void dfs(int u, int p){
sz[u] = c[u];
for(int v : g[u]) if(v != p){
par[v] = u;
h[v] = h[u] + 1;
dfs(v, u);
sz[u]+= sz[v];
}
}
void update_edge(int u, int v, int w){
if(h[u] < h[v]) swap(u, v);
while(h[u] > h[v]){
weight[u] = min(weight[u], w);
u = par[u];
}
while(u != v){
weight[u] = min(weight[u], w);
weight[v] = min(weight[v], w);
u = par[u], v = par[v];
}
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
freopen("kieuoanh.inp", "r", stdin);
freopen("kieuoanh.out", "w", stdout);
cin >> n >> m >> k;
vector <array <int, 3>> edges;
for(int i = 1; i <= m; i++){
int u, v, w; cin >> u >> v >> w;
edges.push_back({w, u, v});
}
for(int i = 1; i <= k; i++) cin >> SE[i].u >> SE[i].v;
for(int i = 1; i <= n; i++) cin >> c[i];
reset_dsu();
sort(edges.begin(), edges.end());
int cnt = 0;
for(array <int, 3> it : edges){
int u = it[1], v = it[2], w = it[0];
if(joint(u, v)){
MST[++ cnt] = {u, v, w};
}
}
ll ans = 0;
reset_dsu();
for(int mask = 0; mask < (1 << k); mask++){
bool ok = 1;
for(int i = 1; i <= n; i++) g[i].clear(), lab[i] = - 1, weight[i] = 2e9;
for(int i = 0; i < k; i++) if((mask >> i) & 1){
if(!joint(SE[i + 1].u, SE[i + 1].v)){
ok = false;
break;
}
if((mask >> i) & 1){
g[SE[i + 1].u].push_back(SE[i + 1].v);
g[SE[i + 1].v].push_back(SE[i + 1].u);
}
}
if(!ok) continue;
vector <int> in_MST(n + 2);
for(int i = 1; i <= n - 1; i++){
if(joint(MST[i].u, MST[i].v)){
in_MST[i] = 1;
g[MST[i].u].push_back(MST[i].v);
g[MST[i].v].push_back(MST[i].u);
}
}
dfs(1, - 1);
for(int i = 1; i <= n; i++) if(!in_MST[i]){
update_edge(MST[i].u, MST[i].v, MST[i].w);
}
ll sum = 0;
for(int i = 0; i < k; i++) if((mask >> i) & 1){
int u = SE[i + 1].u, v = SE[i + 1].v;
if(h[u] > h[v]) swap(u, v);
sum+= 1LL * weight[v] * sz[v];
}
ans = max(ans, sum);
}
cout << ans;
return 0;
}
