#include <bits/stdc++.h>
#include <atcoder/all>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
using Bint = mp::cpp_int;
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n;
    cin >> n;
    vector<int> p(n);
    rep(i,n) cin >> p[i];
    int m;
    cin >> m;
    vector<int> u(m), v(m);
    rep(i,m) {
        cin >> u[i] >> v[i];
        --u[i],--v[i];
    }
    int k;
    cin >> k;
    vector<int> a(k), b(k), s(k);
    rep(i,k) {
        cin >> a[i] >> b[i] >> s[i];
        --a[i];--b[i];
    }
    mf_graph<ll> g(n+k+2);
    int S = n+k;
    int T = S+1;
    ll ans = 0;
    rep(i,n) {
        if(p[i]<0) g.add_edge(i, T, -p[i]);
        else {
            ans += p[i];
            g.add_edge(S,i,p[i]);
        }
    }
    rep(i,m) {
        g.add_edge(v[i], u[i], 1e18);
    }
    rep(i,k) {
        ans += s[i];
        g.add_edge(S,n+i,s[i]);
        g.add_edge(n+i,a[i],1e18);
        g.add_edge(n+i,b[i],1e18);
    }
    ans -= g.flow(S,T);
    cout << ans << endl;
    return 0;
}