#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int n,m;
  cin>>n>>m;
  vector<Int> x(m),y(m),z(m);
  for(Int i=0;i<m;i++) cin>>x[i]>>y[i]>>z[i];
  Int s=1<<n;
  vector<vector<Int> > sc(n,vector<Int>(s,0));
  for(Int i=0;i<n;i++){
    for(Int b=0;b<s;b++){
      for(Int j=0;j<m;j++){
        if(y[j]!=i) continue;
        if((b>>x[j])&1) sc[i][b]+=z[j];
      }
    }
  }
  vector<Int> dp(s,0);
  for(Int b=0;b<s;b++){
    for(Int i=0;i<n;i++){
      if((b>>i)&1) continue;
      chmax(dp[b|(1<<i)],dp[b]+sc[i][b]);
    }
  }
  cout<<*max_element(dp.begin(),dp.end())<<endl;
  return 0;
}