N, M = map(int, input().split())
scores = [[] for _ in range(N)]

for _ in range(M):
    item1, item2, score = map(int, input().split())
    scores[item2].append((item1, score))

dp = [0] * (1<<N)

for S in range((1<<N)-2, -1, -1):
    for n in range(N):
        if not (S>>n)&1:
            add = 0
            
            for prev, score in scores[n]:
                if (S>>prev)&1:
                    add += score
                    
            dp[S] = max(dp[S], dp[S|(1<<n)]+add)

print(dp[0])