#include <iostream>
#include <algorithm>
#include <cstdio>

using namespace std;
const int MAX_N = 16;
int dp[1 << MAX_N] = {0};
int score_tbl[MAX_N][MAX_N] = {0};
int main(){
    int n,m;
    cin >> n >> m;
    int a,b,score;

    for(int i = 0; i < m; i++){
        cin >> a >> b >> score;
        score_tbl[a][b] = score;
    }

    for(int i = 0; i < 1 << n; i++){
        for(int j = 0; j < m; j++){
            for(int k = 0; k < m; k++){
                if(((i >> j) & 1) && !((i >> k) & 1)){
                    dp[i | 1 << k] = max(dp[i | 1 << k],dp[i] + score_tbl[j][k]);
                }
            }
        }
    }
    
    cout << dp[(1 << n)-1] << endl;
    return 0;
}