#include "bits/stdc++.h"
using namespace std;
int main()
{
	int N,M;
	std::cin >> N >> M;
	std::vector<std::vector<int>> table(N,std::vector<int>(N,0));
	std::vector<int> dp(1<<N,0);
	
	for(int i=0;i<M;++i){
		int t1,t2,sc;
		std::cin >> t1 >> t2 >> sc;
		table[t1][t2]=sc;
	}
	for(int i=0;i<(1<<N);++i){
		for(int j=0;j<N;++j){
			if(i&(1<<j))continue;
			int sc = dp[i];
			for(int k=0;k<N;++k)
				if(i&(1<<k))sc+=table[k][j];
			dp[i|(1<<j)]=std::max(dp[i|(1<<j)],sc);
		}
	}
	int ans = dp[(1<<N)-1];
	std::cout << ans << std::endl;
    return 0;
}