import itertools
N, M = [int(i) for i in input().strip().split(" ")]
scores = [[0]*N for i in range(N)]
for i in range(M):
    x,y,score = [int(j) for j in input().strip().split(" ")]
    scores[x][y] = score

max_score = 0
for p in itertools.permutations(range(N)):
    tmp_score = 0
    for i in range(N):
        score = scores[p[i]]
        for j in p[i:]:
            tmp_score += score[j]
    if max_score < tmp_score:
        max_score = tmp_score

print(max_score)