#include <iostream>
#include <vector>
#define repeat(i,n) for (int i = 0; (i) < (n); ++(i))
template <class T> bool setmax(T & l, T const & r) { if (not (l < r)) return false; l = r; return true; }
using namespace std;
int main() {
    int n, m; cin >> n >> m;
    vector<vector<int> > score(n, vector<int>(n));
    repeat (i,m) {
        int x, y, z; cin >> x >> y >> z;
        score[x][y] = z;
    }
    vector<int> dp(1<<n);
    repeat (s,1<<n) {
        repeat (i,n) if (not (s & (1<<i))) {
            int acc = dp[s];
            repeat (j,n) if (s & (1<<j)) acc += score[j][i];
            setmax(dp[s | (1<<i)], acc);
        }
    }
    cout << dp[(1<<n)-1] << endl;
    return 0;
}