#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define int long long
using namespace std;
typedef pair<int, int> P;
const int mod = 1000000007;
const int INF = 1e18;

int d[20][20];
int dp[1 << 16][20];

signed main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n, m;
    cin >> n >> m;
    rep(i, 0, n) rep(j, 0, n) d[i][j] = -1;
    rep(i, 0, m){
        int a, b, c;
        cin >> a >> b >> c;
        a--; b--;
        d[a][b] = c;
        d[b][a] = c;
    }
    rep(i, 0, 1 << n) rep(j, 0, n) dp[i][j] = -1;
    rep(i, 0, n) dp[1 << i][i] = 0;
    for(int mask = 0; mask < (1LL << n); mask++){
        for(int i = 0; i < n; i++){
            if(dp[mask][i] == -1) continue;
            for(int j = 0; j < n; j++){
                if(mask & (1LL << j)) continue;
                if(d[i][j] == -1) continue;
                dp[mask | (1LL << j)][j] = max(dp[mask | (1LL << j)][j], dp[mask][i] + d[i][j]);
            }
        }
    }
    int ans = 0;
    rep(i, 0, 1 << n){
        rep(j, 0, n){
            ans = max(ans, dp[i][j]);
        }
    }
    cout << ans << endl;
}