#include <iostream>
#include <vector>
using namespace std;
const int INF = 100000000;
int main(){
	int N, M;
	cin >> N >> M;
	vector<vector<int>> d(N, vector<int>(N, -INF));
	for (int i = 0; i < M; i++){
		int a, b, c;
		cin >> a >> b >> c;
		a--;
		b--;
		d[a][b] = max(d[a][b], c);
		d[b][a] = max(d[b][a], c);
	}
	vector<vector<int>> dp(1 << N, vector<int>(N, -INF));
	for (int i = 0; i < N; i++){
		dp[1 << i][i] = 0;
	}
	for (int i = 1; i < (1 << N); i++){
		for (int j = 0; j < N; j++){
			if (i >> j & 1){
				for (int k = 0; k < N; k++){
					if (!(i >> k & 1)){
						dp[i | (1 << k)][k] = max(dp[i | (1 << k)][k], dp[i][j] + d[j][k]);
					}
				}
			}
		}
	}
	int ans = 0;
	for (int i = 0; i < (1 << N); i++){
		for (int j = 0; j < N; j++){
			ans = max(ans, dp[i][j]);
		}
	}
	cout << ans << endl;
}