N, M = map(int, input().split())
score = [[0]*N for _ in [0]*N]
for a, b, c in (map(int, input().split()) for _ in [0]*M):
    score[a][b] = c

dp = [0]*(2**N)

for bitset in range(2**N):
    current_score = dp[bitset]
    bit_1_list = [i for i in range(N) if bitset & 2**i]

    for bit_0 in range(N):
        if 2**bit_0 & bitset:
            continue
        new_score = current_score + sum(score[bit_1][bit_0] for bit_1 in bit_1_list)
        if new_score > dp[bitset | 2**bit_0]:
            dp[bitset | 2**bit_0] = new_score

print(dp[-1])