from collections import defaultdict

N, M = map(int, input().split())
d = defaultdict(list)
for _ in range(M):
    a, b, c = map(int, input().split())
    d[b].append((a, c))

dp = [-1] * (1 << N)
dp[0] = 0
for i in range(1 << N):
    if dp[i] == -1: continue

    for j in range(N):
        if i & (1 << j): continue
        score = 0
        for x, c in d[j]:
            if i & (1 << x):
                score += c

        ni = i | (1 << j)
        dp[ni] = max(dp[ni], dp[i] + score)

ans = dp[(1 << N) - 1]
print(ans)