#include<bits/stdc++.h>

#define debug(x) cerr << #x << ": " << x << '\n'
#define debugArray(x,n) for(long long hoge = 0; (hoge) < (n); ++ (hoge)) cerr << #x << "[" << hoge << "]: " << x[hoge] << '\n'
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<ll> vll;
const ll INF = INT_MAX;
const ll MOD = 1e9+7;

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  ll N,M;cin>>N>>M;
  vector<tuple<ll,ll> > G[20];
  for(ll i=0;i<M;i++){
    ll a,b,s;cin>>a>>b>>s;
    G[b].emplace_back(make_tuple(a,s));
  }
  ll dp[1<<15];
  for(ll S=0;S<1<<N;S++){
    for(ll i=0;i<N;i++)if(!((S>>i)&1)){
      ll tmp=0;
      for(auto v:G[i])if((S>>get<0>(v))&1){
        tmp+=get<1>(v);
      }
      dp[S|(1<<i)]=max(dp[S|(1<<i)],dp[S]+tmp);
    }
  }
  cout<<dp[(1<<N)-1]<<endl;
  return 0;
}