N, M = map(int, input().split())
tbl = [[0] * N for _ in range(N)]
dp = [0] * (1 << N)
dp[0] = 0
for _ in range(M):
    a, b, score = map(int, input().split())
    tbl[a - 1][b - 1] = score

for msk in range(1 << N):
    for a in range(N):
        # a: 追加するitem
        s = dp[msk]
        if msk & (1 << a):
            continue
        for b in range(N):
            # b: 既に選んだitem
            if msk & (1 << b):
                s += tbl[a][b]
        dp[msk + (1 << a)] = max(dp[msk + (1 << a)], s)

print(dp[-1])