from itertools import permutations

N, M = list(map(int, input().split(' ')))

S = []
for i in range(N):
    S.append([0 for _ in range(N)])

for i in range(M):
    f, t, s = list(map(int, input().split(' ')))
    S[f][t] = s

solution = -1
for p in permutations([i for i in range(N)]):
    score = 0
    for i in range(N):
        for j in range(i+1, N):
            score += S[p[i]][p[j]]
    solution = max(solution, score)
print(solution)