#include <stdio.h>
#define max(X, Y) ((X) > (Y) ? (X) : (Y))
typedef long long ll;
//struct edge {ll cost, ll to; };

const ll INF = 1ll << 60ll;
const ll MINF = -1 * (1ll << 60ll);

ll dp[1 << 18][32];

ll n, m;
ll graph[32][32];
ll a, b, c;
ll ans;

ll dfs(ll pos, ll s);

int main()
{
    scanf("%lld %lld", &n, &m);

    for (int i = 0; i < m; i++) {
        scanf("%lld %lld %lld", &a, &b, &c);

        graph[a][b] = graph[b][a] = max(graph[a][b], c);
    }

    for (int i = 1; i <= n; i++) {

        for (int i = 1 << n; i >= 0; i--) {
            for (int j = 1; j <= n; j++) {
                dp[i][j] = 0;
            }
        }
        
        ans = max(ans, dfs(i, 1 << i));
    }

    printf("%lld\n", ans);
}

ll dfs(ll pos, ll s)
{
    if (dp[s][pos] ) {
        return dp[s][pos];
    }
    
    ll ret = 0;
    for (int i = 1; i <= n; i++) {
        if (graph[pos][i] &&
            !(s & (1 << i))) {

            ret = max(ret, dfs(i, s | (1 << i)) + graph[pos][i]);
        }
    }

    return dp[s][pos] = ret;
}