import itertools

N, M = map(int, input().split())
item1 = [0] * M
item2 = [0] * M
score = [0] * M
max_score = 0

for i in range(M):
    item1[i], item2[i], score[i] = map(int, input().split())

perm = [i for i in range(N)]

p = list(itertools.permutations(perm))

for ichi in p:
    temp = 0
    for i in range(M):
        if ichi[item1[i]-1] < ichi[item2[i]-1]:
            temp += score[i]
    if temp > max_score:
        max_score = temp

print(max_score)