score = [0] * 1000

N, M = map(int, raw_input().split())
for t in xrange(M):
	a, b, c = map(int, raw_input().split())
	score[a * N + b] = c
	
def solve(m):
	res = 0
	for i in xrange(0, N):
		if (m >> i) & 1 == 0:
			tmp = 0
			for j in xrange(0, N):
				if (m >> j) & 1 == 1:
					tmp += score[j * N + i]
			res = max(res, tmp + solve(m | (1 << i)))			
	return res
	
print solve(0)