N,M=map(int,input().split())
graph=[[] for x in range(N)]
for m in range(M):
    a,b,c=map(int,input().split())
    a-=1;b-=1
    graph[a].append((b,c))
    graph[b].append((a,c))
inf=1<<30
dp=[[-inf]*N for bit in range(1<<N)]
for bit in range(1,1<<N):
    for x in range(N):
        if bit==1<<x:
            dp[bit][x]=0
            break
    else:
        for y in range(N):
            if bit&1<<y:
                for x,c in graph[y]:
                    if bit&1<<x:
                        dp[bit][y]=max(dp[bit][y],dp[bit^1<<y][x]+c)
ans=max(max(dp[bit]) for bit in range(1<<N))
print(ans)