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

A = [[0] * N for _ in range(N)]
for _ in range(M):
    u, v, score = map(int, input().split())
    A[u][v] = score

dp = [0] * (1 << N)
for S in range(1 << N):
    for u in range(N):
        if S & (1 << u):
            continue
        # uを加えたときのscoreを計算
        score = 0
        for v in range(N):
            if not (S & (1 << v)):
                continue
            score += A[v][u]
        dp[S ^ (1 << u)] = max(dp[S ^ (1 << u)], dp[S] + score)

print(dp[-1])