// yukicoder: No.845 最長の切符
// 2019.6.29 bal4u

#include <stdio.h>
#include <string.h>

#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif

int in() {   // 非負整数の入力
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf); while ((c = gc()) >= '0');
	return n;
}

int N, M;
int map[16][16];
int dp[65536][16];

int main()
{
	int i, a, b, c, lim, ans;

	N = in(), M = in();
	while (M--) {
		a = in()-1, b = in()-1, c = in();
		if (map[a][b] < c) map[a][b] = map[b][a] = c;
	}

	lim = 1 << N, ans = 0;
	memset(dp, -1, sizeof(dp));
	
	for (a = 0; a < N; a++) dp[1<<a][a] = 0;
	for (i = 0; i < lim; i++) {
		for (a = 0; a < N; a++) for (b = 0; b < N; b++) if (map[a][b] > 0) {
			if (((i >> a) & 1) && !((i >> b) & 1) && dp[i][a] >= 0) {
				c = dp[i][a] + map[a][b];
				if (c > dp[i|(1<<b)][b]) dp[i|(1<<b)][b] = c;
			}
		}
	}
	ans = 0;
	for (i = 0; i < lim; i++) for (a = 0; a < N; a++)
		if (dp[i][a] > ans) ans = dp[i][a];
	printf("%d\n", ans);
	return 0;
}