#include "bits/stdc++.h"
using namespace std;
int main()
{
    int N, M;
    cin >> N >> M;
    int table[N][N];
    int dp[1<<N];
    
    for(int i = 0 ; i < M ; ++i)
    {
        int i1, i2, sc;
        cin >> i1 >> i2 >> sc;
        table[i1][i2] = sc;
    }
    for(int i = 0 ; i < (1<<N) ; ++i)for(int j = 0 ; j < N ; ++j )
    {
        if(i &(1<<j)) continue;
        int sc = dp[i];
        for(int k = 0 ; k < N ; ++k)
        {
            if(i & (1<<k)) sc += table[k][j];
        }
        dp[i | (1<<j)] = max(dp[i|(1<<j)], sc);
    }
    cout << dp[(1<<N) -1] << endl;
    return 0;
}