import itertools

N, M = map(int, input().split())
all_pattern = list(itertools.permutations(range(N))) # 順列
result = [0] * len(all_pattern)

for _ in range(M):
    item1, item2, score = map(int, input().split())
    for i, pattern in enumerate(all_pattern):
        sts = False
        for item in pattern:
            if item == item2 and not sts:
                break
            elif item == item1 and not sts:
                sts = True
            elif item == item2 and sts:
                result[i] += score
                break

print(max(result))