// #define DEBUGGING
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ALL(V) (V).begin(), (V).end()
#define ALLR(V) (V).rbegin(), (V).rend()

template <typename T> using V = vector<T>;
template <typename T> using VV = V<V<T>>;
template <typename T, typename U> using P = pair<T, U>;
using ll = int64_t;
using PLL = P<ll, ll>;

template <typename T> const T& var_min(const T &t) { return t; }
template <typename T> const T& var_max(const T &t) { return t; }
template <typename T, typename... Tail> const T& var_min(const T &t, const Tail&... tail) { return min(t, var_min(tail...)); }
template <typename T, typename... Tail> const T& var_max(const T &t, const Tail&... tail) { return max(t, var_max(tail...)); }
template <typename T, typename... Tail> void chmin(T &t, const Tail&... tail) { t = var_min(t, tail...); }
template <typename T, typename... Tail> void chmax(T &t, const Tail&... tail) { t = var_max(t, tail...); }
template <typename T> const T& clamp(const T &t, const T &low, const T &high) { return max(low, min(high, t)); }
template <typename T> void chclamp(T &t, const T &low, const T &high) { t = clamp(t, low, high); }

namespace init__ {

struct InitIO {
    InitIO() {
        cin.tie(nullptr);
        ios_base::sync_with_stdio(false);
        cout << fixed << setprecision(30);
    }
} init_io;

}

#ifdef DEBUGGING
#include "../debug.cpp"
#else
#define DEBUG(...) 0
#define DEBUG_SEPARATOR_LINE 0
#endif

template <typename T>
T make_v(T init) { return init; }

template <typename T, typename... Tail>
auto make_v(T init, size_t s, Tail... tail) {
#define rec make_v(init, tail...)
    return V<decltype(rec)>(s, rec);
#undef rec
}

int main() {
    ll N, M;
    cin >> N >> M;
    VV<PLL> edges(N);
    for(ll i = 0; i < M; i++) {
        ll a, b, c;
        cin >> a >> b >> c;
        a--; b--;
        edges[a].emplace_back(b, c);
        edges[b].emplace_back(a, c);
    }

    auto check = [&](ll S, ll now) { return ((S >> now) & 1); };

    auto dp = make_v((ll)-1, 1ll << N, N);
    for(ll i = 0; i < N; i++) dp[1ll << i][i] = 0;
    for(ll S = 0; S < (1ll << N); S++) {
        for(ll now = 0; now < N; now++) {
            if(!check(S, now)) continue;
            for(auto edge : edges[now]) {
                ll nxt, dist;
                tie(nxt, dist) = edge;
                if(check(S, nxt)) continue;
                ll nxtS = S | (1ll << nxt);
                chmax(dp[nxtS][nxt], dp[S][now] + dist);
            }
        }
    }

    ll ans = 0;
    for(const auto &v : dp) for(const auto &ele : v) chmax(ans, ele);
    cout << ans << endl;
    return 0;
}