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

typedef vector<int> vi;
typedef vector<vi> vvi;

int main()
{
	int N, M;
	cin >> N >> M;

	vvi score(N, vi(N, 0));
	rep(i, 0, M)
	{
		int x, y, s;
		cin >> x >> y >> s;
		score[x][y] = s;
	}

	vi dp(1 << N, 0);
	rep(mask, 0, 1 << N)
	{
		rep(i, 0, N) if ((mask&(1 << i)) == 0)
		{
			int x = 0;
			rep(j, 0, N) if ((mask&(1 << j)) != 0)
			{
				x += score[i][j];
			}
			int k = mask + (1 << i);
			dp[k] = max(dp[k], dp[mask] + x);
		}
	}

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