#include<bits/stdc++.h>
using namespace std;
int main() {
	freopen("road.in","r",stdin);
	freopen("road.out","w",stdout);
	int n,m,k;
	cin>>n>>m>>k;
	int ans=0;
	int a,b,c;
	for(int i=1; i<=m; i++) {
		cin>>a>>b>>c;
		ans+=c;
	}
	cout<<ans;
	return 0;
}
