#include <bits/stdc++.h>
// #include <atcoder/all>
// using namespace atcoder;
#define rep(i, n) for (int i = 0; i < (n); i++)
using ll = long long;
using namespace std;
const int mod = 1000000007;
const int INF =1e9+1;
int main(){
  int n,m;cin>>n>>m;
  int n2 = 1<<n;
  vector<vector<int>> score(n,vector<int> (n));
  vector<int> dp(n2);
  rep(i,m){
    int a,b,c;cin>>a>>b>>c;
    score[a][b]=c;
  }
  rep(i,n2){
    rep(j,n){
      if(i>>j&1)continue;
      int now=0;
      rep(k,n){
        if(!(i>>k&1))now+=score[j][k];
        dp[i|1<<j]=max(dp[i|1<<j],dp[i]+now);
      }
    }
  }
  cout<<dp[n2-1]<<endl;
}