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

#include "atcoder/mincostflow"
using namespace atcoder;

int main(void){
    int k,n,m;
    cin >> k >> n >> m;
    mcf_graph<long long, long long> g(n+2);
    vector<int> a(k);
    for(int i=0;i<k;++i){
        cin >> a[i];
        g.add_edge(0,a[i],1,0);
    }
    vector<int> b(n);
    for(int i=0;i<n;++i){
        cin >> b[i];
        g.add_edge(i+1,n+1,b[i],0);
    }
    vector<int> u(m);
    vector<int> v(m);
    vector<long long> d(m);
    for(int i=0;i<m;++i){
        cin >> u[i] >> v[i] >> d[i];
        g.add_edge(u[i],v[i],1e9,d[i]);
        g.add_edge(v[i],u[i],1e9,d[i]);
    }
    cout << g.flow(0,n+1).second << endl;
    return 0;
}