import itertools

N, M = map(int, input().split())
score = [[0 for j in range(N)] for i in range(N)]
for i in range(M):
    a, b, s = map(int, input().split())
    score[a][b] = s
max_score = 0
for p in itertools.permutations(range(N)):
    s = 0
    for i in range(N - 1):
        for j in range(i + 1, N):
            s += score[p[i]][p[j]]
    max_score = max(max_score, s)
print(max_score)