from collections import defaultdict

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

G = defaultdict(dict)
for _ in range(M):
    u, v, score = map(int, input().split())
    G[v][u] = score

dp = [0] * (1 << N)

for bit in range(1 << N):
    for u in range(N):
        if bit >> u & 1:
            continue
        tot = 0
        for v in range(N):
            if ~bit >> v & 1:
                continue
            if v in G[u]:
                tot += G[u][v]
        dp[bit | (1 << u)] = max(dp[bit | (1 << u)], dp[bit] + tot)

print(dp[-1])