// Problem: No.2604 Initial Motion
// Contest: yukicoder
// URL: https://yukicoder.me/problems/no/2604
// Memory Limit: 512 MB
// Time Limit: 3000 ms

#include<bits/stdc++.h>
#include <atcoder/mincostflow>
#define debug(x) cerr<<(#x)<<" "<<(x)<<endl
using namespace atcoder;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
#define pii pair<ll,ll>
#define rep(i,a,b) for(ll i=(a);i<=(b);++i)
#define per(i,a,b) for(ll i=(a);i>=(b);--i)
using namespace std;
ll read(){
	ll x=0,f=1;char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
	while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
	return x*f;
}
void write(ll x){
	if(x<0)putchar('-'),x=-x;
	if(x>9)write(x/10);
	putchar(x%10+'0');
}
const ll N=2e3+5,INF=1e18;
ll n,m,S,T;
ll dis[N],ok[N],a[N],b[N],k;
vector<pii>to[N];
int main(){
	k=read(),n=read(),m=read();
	rep(i,1,k)a[i]=read();
	rep(i,1,n)b[i]=read();
	rep(i,1,m){
		ll x=read(),y=read(),z=read();
		to[x].push_back(make_pair(y,z));
		to[y].push_back(make_pair(x,z));
	}
    mcf_graph<ll, ll> g(n+k+2);
    ll S = 0, T= n+k+1;
	rep(i,1,k){
		rep(j,1,n)dis[j]=INF,ok[j]=0;
		dis[a[i]]=0;
		priority_queue<pii>q;
		q.push(make_pair(0,a[i]));
		while(!q.empty()){
			pii now=q.top();q.pop();
			ll u=now.second;
			if(ok[u])continue;
			ok[u]=1;
			for(pii es:to[u]){
				ll v=es.first,w=es.second;
				if(dis[v]>dis[u]+w){
					dis[v]=dis[u]+w;
					q.push(make_pair(-dis[v],v));
				}
			}
		}
		rep(j,1,n){
			if(b[j])g.add_edge(i,j+k,1,dis[j]);
		}
		g.add_edge(S,i,1,0);
	}
	
	rep(i,1,n){
		if(b[i])g.add_edge(i+k,T,b[i],0);
	}
    pii result = g.flow(S,T, INF);
	write(result.second);
	return 0;
}