import sys
input = sys.stdin.readline

N, K = map(int, input().split())
dp = [-10**18]*(N+1)
dp[0] = 0

for i in range(N):
    A, M = map(int, input().split())
    B = list(map(int, input().split()))
    
    dp[i+1] = max(dp[i+1], dp[0]-A)
    
    for Bi in B:
        dp[i+1] = max(dp[i+1], dp[Bi])
    
    dp[0] = max(dp[0], dp[i+1]+A)

print(dp[0])