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

S = []
for i in range(N):
    S.append([0 for _ in range(N)])

for i in range(M):
    f, t, s = list(map(int, input().split(' ')))
    S[f][t] = s

# score for each bit vector expressing that each number is used or not    
dp = [0 for _ in range(1 << N)]

for p in range(1 << N):
    for i in range(N):
        # if 'i' is not used yet at p, calculate the score when 'i' is used at p
        if (p & (1 << i)) == 0:
            score = dp[p]
            for j in range(N):
                if (p & (1 << j)) != 0:
                    score += S[j][i]
            # update the score when 'i' used at p
            dp[p | (1 << i)] = max(dp[p | (1 << i)], score)
# check the score when all the number is used            
print(dp[(1 << N)-1])