n,m=map(int,input().split())
items=[[0]*n for _ in range(n)]
for _ in range(m):
    item1,item2,score=map(int,input().split())
    item1,item2=item1-1,item2-1
    items[item1][item2]=score

dp=[0]*(1<<n)
for mask in range(1<<n):
    for i in range(n):
        if (mask>>i&1):continue
        
        tot=0
        for j in range(n):
            if mask>>j&1:
                tot+=items[j][i]
            
        dp[mask|1<<i]=max(dp[mask|1<<i],dp[mask]+tot)

print(dp[-1])