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

score = [[0 for _ in range(N)] for _ in range(N)]
for _  in range(M):
    temp = list(map(int, input().split()))
    score[temp[0]][temp[1]] = temp[2]

dp = [0 for _ in range(2 ** N)]

for msk in range(0, 2 ** N):
    for a in range(N):
        if not(msk & (1<<a)):
            x = 0
            for i in range(N):
                if not(msk & (1<<i)):
                    x += score[a][i]
            dp[msk + (1 << a)] = max(dp[msk + (1 << a)], dp[msk] + x)
print(dp[-1])