#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <complex>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <iomanip>
#include <assert.h>
#include <array>
#include <cstdio>
#include <cstring>
#include <random>
#include <functional>
#include <numeric>
#include <bitset>

using namespace std;

void main_(); signed main() {
  cin.tie(0); ios::sync_with_stdio(false);
  main_(); return 0;
}

#define REP(i,a,b) for(int i=a;i<(int)b;i++)
#define rep(i,n) REP(i,0,n)
#define all(c) (c).begin(), (c).end()
#define zero(a) memset(a, 0, sizeof a)
#define minus(a) memset(a, -1, sizeof a)
template<class T1, class T2> inline bool minimize(T1 &a, T2 b) { return b < a && (a = b, 1); }
template<class T1, class T2> inline bool maximize(T1 &a, T2 b) { return a < b && (a = b, 1); }

typedef long long ll;
int const inf = 1<<29;

int N, M;
vector<pair<int, int>> g[15];

int dp[1<<15];

int dfs(int bit) {
  if(bit == (1 << N)-1) { return 0; }
  int& ret = dp[bit];
  if(ret + 1) { return ret; }
  ret = 0;
  rep(i, N) {
    if(!(bit >> i) & 1) { continue; }
    rep(j, N) {
      if(bit >> j & 1) { continue; }
      // jを新しく使う
      auto iter = lower_bound(all(g[i]), make_pair(j, -inf));
      if(iter != g[i].end()) {
        maximize(ret, dfs(bit | (1<<j)) + iter->second);
      }
    }
  }
  return ret;
}

void main_() {

  minus(dp);

  cin >> N >> M;
  rep(i, M) {
    int i1, i2, s; cin >> i1 >> i2 >> s;
    g[i2].emplace_back(i1, s);
  }
  rep(i, 15) {
    sort(all(g[i]));
  }
  
  int res = 0;
  rep(i, N) {
    maximize(res, dfs(1<<i));
  }

  cout << res << endl;
  
}