n, m = map(int, input().split())
from collections import defaultdict
d = defaultdict(lambda: [])
for i in range(m):
    a, b, c = map(int, input().split())
    d[b].append((a, c))
INF = 10**18
dp = [-INF]*(1<<n)
dp[0] = 0
for s in range(1<<n):
    for i in range(n):
        if (s>>i)&1:
            continue
        ns = s|(1<<i)
        x = 0
        for j, c in d[i]:
            if (s>>j)&1:
                x += c
        dp[ns] = max(dp[ns], dp[s]+x)
print(dp[-1])