#include<bits/stdc++.h>
using namespace std;
int n,m,ans;
int a[10004],b[10004],c[401][401];
int main(){
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	for(int i=1;i<=n;i++){
		cin>>b[i];
	}
	int x,y,z;
	for(int i=1;i<=m;i++){
		cin>>x>>y>>z;
		c[x][y]=z;
	}
	for(int i=1;i<=n;i++){
		if(a[i]==b[i]) continue;
		if(c[a[i]][b[i]]) x=c[a[i]][b[i]];
		else x=INT_MAX;
		if(c[b[i]][a[i]]) y=c[b[i]][a[i]];
		else y=INT_MAX;
		if(x==INT_MAX&&y==INT_MAX){
			cout<<-1;
			return 0;
		}
		else ans+=min(x,y);
	}
	cout<<ans;
}
/**************************************************************
	Problem: 2355
	User: wuyunfeng
	Language: C++
	Result: Wrong Answer
****************************************************************/