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

master = [[0] * N for _ in range(N)]
for _ in range(M):
    i1, i2, score = map(int, input().split())
    master[i1][i2] = score

dp = [0] * (1 << N)
for S in range(1, 1 << N):
    for u in range(N):
        if not (S & (1 << u)):
            continue

        score = 0
        for v in range(N):
            if S & (1 << v):
                score += master[u][v]

        dp[S] = max(dp[S], dp[S ^ (1 << u)] + score)

print(dp[-1])