#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll = long long;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using VD = vector<double>;
using VVD = vector<VD>;
using VS = vector<string>;
using P = pair<ll,ll>;
using VP = vector<P>;
#define rep(i, n) for (ll i = 0; i < ll(n); i++)
#define out(x) cout << x << endl
#define dout(x) cout << fixed << setprecision(10) << x << endl
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
#define sz(x) (int)(x.size())
#define re0 return 0
#define pcnt __builtin_popcountll
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
constexpr int inf = 1e9;
constexpr ll INF = 1e18;
//using mint = modint1000000007;
using mint = modint998244353;
int di[4] = {1,0,-1,0};
int dj[4] = {0,1,0,-1};

int main(){
    ll k,n,m;
    cin >> k >> n >> m;
    VL a(k),b(n);
    rep(i,k) cin >> a[i];
    rep(i,n) cin >> b[i];
    mcf_graph<ll,ll> g(n+2);
    ll si = n,ti = si+1;
    rep(i,m){
        ll u,v,d;
        cin >> u >> v >> d;
        u--,v--;
        g.add_edge(u,v,INF,d);
        g.add_edge(v,u,INF,d);
    }
    rep(i,k) g.add_edge(si,a[i]-1,1,0);
    rep(i,n) g.add_edge(i,ti,b[i],0);
    ll ans = g.flow(si,ti).second;
    out(ans);
}