#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)





int N, M;
int S[14][14];
//-----------------------------------------------------------------
int dp[1 << 14];
int main() {
	cin >> N >> M;
	rep(i, 0, M) {
		int a, b, c;
		cin >> a >> b >> c;
		S[a][b] = c;
	}

	rep(ma, 0, 1 << N) {
		rep(i, 0, N) if (!(ma & (1 << i))) {
			int mama = ma + (1 << i);
			int point = 0;
			rep(j, 0, N) if (ma & (1 << j)) point += S[j][i];
			dp[mama] = max(dp[mama], dp[ma] + point);
		}
	}

	cout << dp[(1 << N) - 1] << endl;
}