#include <bits/stdc++.h>
using namespace std;
 
#define rep(i, j, n) for(int i=j;i<n;++i)
#define all(i) i.begin(),i.end()
#define rall(i) i.rbegin(),i.rend()
#define INF 1e9
#define LINF 1e18
const int mod = 1e9 + 7;
 
typedef long long i64;
typedef pair<int, int> pi;
 
template <class T> using vt = vector<T>;
template <class T> using vvt = vector<vector<T>>;

i64 gcd(i64 n, i64 m) {return (m == 0? n : gcd(m, n % m));}
i64 lcm(i64 n, i64 m) {return (n / gcd(n, m) * m);}

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

  int n, m;
  cin >> n >> m;
  vvt<int> score(n, vt<int>(n, 0));
  rep(i, 0, m) {
    int a, b, s;
    cin >> a >> b >> s;
    score[a][b] = s;
  }

  vt<int> dp(1 << n, 0);
  rep(bit, 0, (1 << n)) {
    rep(v, 0, n) {
      if(bit & (1 << v)) continue;

      int sum = 0;
      rep(i, 0, n) {
        if(bit & (1 << i)) sum += score[i][v];
      }
      dp[bit | (1 << v)] = max(dp[bit | (1 << v)], dp[bit] + sum);
    }
  }
  cout << dp[(1 << n) - 1] << endl;
}