#include <bits/stdc++.h>
using namespace std;

int main() {
    int N, M;
    cin >> N >> M;
    vector<vector<long long>> dist(N, vector<long long>(N, -1 << 30));
    for (int i = 0; i < M; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        a--; b--;
        dist[a][b] = dist[b][a] = c;
    }

    vector<vector<long long>> dp(1 << N, vector<long long>(N, -1LL << 60));
    for (int i = 0; i < N; i++) dp[1 << i][i] = 0;
    for (int i = 0; i < (1 << N); i++) {
        for (int j = 0; j < N; j++) {
            if ((i >> j) & 1 == 0) continue;
            int l = i ^ (1 << j);
            for (int k = 0; k < N; k++) {
                if ((l >> k) & 1 == 0) continue;
                dp[i][j] = max(dp[i][j], dp[l][k] + dist[k][j]);
            }
        }
    }

    long long 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;
}