import itertools

N, M = map(int, input().split())
score_table = []
for i in range(M):
    score_table.append(list(map(int, input().split())))

perms = itertools.permutations(list(range(N)))

total_score_list = []
for perm in perms:
    total_score = 0
    for [back, forth, score] in score_table:
        index_back = perm.index(back)
        index_forth = perm.index(forth)
        if index_back < index_forth:
            total_score += score
    total_score_list.append(total_score)

print(max(total_score_list))