n,m=map(int,input().split())
score=[[0]*n for _ in range(n)]
for _ in range(m):
    a,b,s=map(int,input().split())
    score[a][b]=s

dp=[[0]*n for _ in range(1<<n)]
for s in range(1<<n):
    # 配られる側
    for v in range(n):
        if (s>>v)&1:
            continue
        # 配る側
        for u in range(n):
            if (s>>u)&1 :
                dp[s|(1<<v)][v] = max(dp[s|(1<<v)][v],dp[s][u]+score[u][v]) 

print(max(dp[(1<<n)-1]))