#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}

int main() {
	int n = ri(), m = ri();
	int a[m], b[m], c[m];
	for (int i = 0; i < m; i++) a[i] = ri() - 1, b[i] = ri() - 1, c[i] = ri();
	std::map<int, int> hens[n];
	for (int i = 0; i < m; i++) {
		if (hens[a[i]].count(b[i])) hens[a[i]][b[i]] = std::max(hens[a[i]][b[i]], c[i]);
		else hens[a[i]][b[i]] = c[i];
		if (hens[b[i]].count(a[i])) hens[b[i]][a[i]] = std::max(hens[b[i]][a[i]], c[i]);
		else hens[b[i]][a[i]] = c[i];
	}
	int dp[1 << n][n];
	for (int i = 0; i < 1 << n; i++)
		for (int j = 0; j < n; j++) dp[i][j] = -1;
	for (int i = 0; i < n; i++) dp[1 << i][i] = 0;
	for (int i = 0; i < 1 << n; i++) {
		for (int j = 0; j < n; j++) {
			if (dp[i][j] < 0) continue;
			for (auto &k : hens[j]) {
				if (i >> k.first & 1) continue;
				dp[i | 1 << k.first][k.first] = std::max(dp[i | 1 << k.first][k.first], dp[i][j] + k.second);
			}
		}
	}
	int res = 0;
	for (int i = 0; i < 1 << n; i++)
	for (int j = 0; j < n; j++) res = std::max(res, dp[i][j]);
	std::cout << res << std::endl;
	return 0;
}