#include <iostream>
using namespace std;
int main(){
  int n,m;cin>>n>>m;
  if(m==1){
    int a,b,c;cin>>a>>b>>c;
    cout << c << endl;
  }else{
    int re = 0;
    for(int i = 0; m > i; i++){
      int a,b,c;cin>>a>>b>>c;
      re += c;
    }
    cout << re << endl;
  }
}