mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.buffer.readline

    N, K = map(int, input().split())
    dp = [-10 ** 17] * (N+1)
    dp[0] = 0
    for i in range(1, N+1):
        a, M = map(int, input().split())
        B = list(map(int, input().split()))
        for b in B:
            dp[i] = max(dp[i], dp[b])
        dp[i] = max(dp[i], dp[0] - a)
        dp[0] = max(dp[0], dp[i] + a)
    print(max(dp))


if __name__ == '__main__':
    main()