N, M = map(int, input().split())
item = [list(map(int, input().split())) for _ in range(M)]

INF = 1<<60

point = [[0]*N for _ in range(N)]
for a, b, score in item:
    point[a][b] = score

dp = [-INF]*(1<<N)
dp[0] = 0
for bit in range(1<<N):
    for i in range(N):
        if not 1<<i & bit:
            SUM = 0
            for j in range(N):
                if not 1<<j & bit and j != i:
                    SUM += point[i][j]
            dp[bit|1<<i] = max(dp[bit|1<<i], dp[bit]+SUM)

print(dp[-1])