#include<bits/stdc++.h>
using lint=long long;
void cmx(lint&x,lint y){if(x<y)x=y;}
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint n,m;std::cin>>n>>m;
    std::vector<std::vector<lint>>a(n,std::vector<lint>(n));
    while(m--){
        lint u,v,w;std::cin>>u>>v>>w;
        a.at(u).at(v)=w;
    }
    lint N=1ll<<n;
    std::vector<lint>dp(N,0);
    for(lint bs=0;bs<N;bs++){
        for(lint i=0;i<n;i++){
            if(bs>>i&1)continue;
            lint x=0;
            for(lint j=0;j<n;j++){
                if(!(bs>>j&1))continue;
                x+=a.at(j).at(i);
            }
            cmx(dp.at(bs|1ll<<i),dp.at(bs)+x);
        }
    }
    std::cout<<dp.at(N-1)<<'\n';
}