#include <stdio.h>

int a[72], b[72], c[72], n, m, used[9]={}, d[9], sum=0;

int score()
{
	int x = 0, i, j;
	for( i = 0; i < m; i++) {
		int l, r;
		for( j = 0; j < n; j++) {
			if( a[i] == d[j]) l = j;
			if( b[i] == d[j]) r = j;
		}
		if( l < r) x += c[i];
	}
	return x;
}

void saiki2(int num)
{
	int i;

	if( num == n) {
		int x2;
		x2 = score();
		if( x2 > sum ) sum = x2;
	} else {
		for( i = 0; i < n; i++) {
			if(used[i] == 0) {
				used[i] = 1;
				d[num] = i;
				saiki2(num + 1);
				used[i] = 0;
				d[num] = 10;
			}
		}
	}
}

int main(void)
{
	int i;
	scanf("%d %d", &n, &m);
	for( i = 0; i < m; i++) {
		scanf("%d %d %d", &a[i], &b[i], &c[i]);
	}
	saiki2(0);
	printf("%d\n", sum);

	return 0;
}