#include<bits/stdc++.h>
using namespace std;

#define int long long
typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,f,n) for(int i=(f);i<(n);i++)
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
template<class T,class U>inline void chmin(T &t,U f){if(t>f)t=f;}
template<class T,class U>inline void chmax(T &t,U f){if(t<f)t=f;}

int dp[1<<14];
int N,M;
int A[11111],B[11111],C[11111];

signed main(){
    cin>>N>>M;
    rep(i,M)cin>>A[i]>>B[i]>>C[i];

    rep(i,1<<N){
        rep(j,N){
            if(i>>j&1)continue;
            int add=0;
            rep(k,M)if((i>>A[k]&1)&&B[k]==j)add+=C[k];
            chmax(dp[i|(1<<j)],dp[i]+add);
        }
    }
    cout<<dp[(1<<N)-1]<<endl;
    return 0;
}