from itertools import permutations

n, m = [int(s) for s in input().split()]
table = []

for i in range(m):
    table.append([int(s) for s in input().split()])


max_score = 0
for perm in permutations(range(n), n):
    score = 0
    for i1, i2, sc in table:
        if perm[i1] < perm[i2]:
            score += sc
    max_score = max(max_score, score)

print(max_score)