def rec(S):
    if memo[S] != -1:
        return memo[S]
    
    if S == (1<<N)-1:
        memo[S] = 0
        return 0
    
    res = 0
    
    for n in range(N):
        if not (S>>n)&1:
            add = 0
            
            for prev, score in scores[n]:
                if (S>>prev)&1:
                    add += score
                    
            res = max(res, rec(S|(1<<n))+add)
    
    memo[S] = res
    
    return res

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))

memo = [-1] * (1<<N)

print(rec(0))