from itertools import permutations

N, M = map(int, raw_input().strip().split())
i1 = [0] * M
i2 = [0] * M
score = [0] * M
for i in range(M):
    i1[i], i2[i], score[i] = map(int, raw_input().strip().split())


def total(r):
    res = 0
    for i in range(M):
        if r[i1[i]] < r[i2[i]]:
            res += score[i]
    return res

print(max(total(r) for r in permutations(range(N))))