import itertools

n, m = map(int, input().split())
rules = []
for _ in range(m):
    a, b, s = map(int, input().split())
    rules.append((a, b, s))

max_score = 0

for perm in itertools.permutations(range(n)):
    pos = [0] * n
    for idx, item in enumerate(perm):
        pos[item] = idx
    current = 0
    for a, b, s in rules:
        if pos[a] < pos[b]:
            current += s
    if current > max_score:
        max_score = current

print(max_score)