#include <bits/stdc++.h>
using namespace std;
#define FOR(i, n) for(int i = 0; i < (n); i++)
#define MEM(a, x) memset(a, x, sizeof(a))
#define ALL(a) a.begin(), a.end()
#define UNIQUE(a) a.erase(unique(ALL(a)), a.end())
typedef long long ll;
typedef pair<int, int> P;

int n, m, dp[1<<15], i1[300], i2[300], score[300];

int main(int argc, char const *argv[]) {
	ios_base::sync_with_stdio(false);
	cin >> n >> m;
	FOR(i, m) cin >> i1[i] >> i2[i] >> score[i];
	for (int s = 1<<15-1; s >= 0; s--)  {
		FOR(i, m) {
			if (s>>i1[i] & 1 && !(s>>i2[i] & 1)) {
				dp[s] = max(dp[s], dp[s|1<<i2[i]]+score[i]);
			}
		}
	}
	cout << dp[1<<n-1] << endl;
	return 0;
}