#include <bits/stdc++.h>

using namespace std;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n, m;
  cin >> n >> m;

  vector<vector<int> > score(n, vector<int>(n));
  for (int i = 0; i < m; i++) {
    int x, y, t;
    cin >> x >> y >> t;
    score[y][x] = t;
  }

  vector<int> dp(1<<n);;
  for (int mask = 0; mask < 1<<n; mask++) {
    for (int i = 0; i < n; i++) {
      if (mask & 1 << i) continue;
      int tmp = 0;
      for (int j = 0; j < n; j++) {
        if (mask & 1 << j)
          tmp += score[i][j];
      }
      dp[mask | 1 << i] = max(dp[mask | 1 << i], dp[mask] + tmp);
    }
  }
  
  cout << dp[(1<<n) - 1] << endl;
  
  return 0;
}