#include <stdio.h>

void chmax(long long* a, long long b)
{
	if (*a < b) *a = b;
}

int main()
{
	const long long sup = 1LL << 60, inf = -sup;
	int i, j, N, K, A[100001], M, B;
	long long dp[100001];
	scanf("%d %d", &N, &K);
	for (i = 1, dp[0] = 0; i <= N; i++) dp[i] = inf;
	for (i = 1; i <= N; i++) {
		scanf("%d %d", &(A[i]), &M);
		chmax(&(dp[i]), dp[0] - A[i]);
		for (j = 1; j <= M; j++) {
			scanf("%d", &B);
			chmax(&(dp[i]), dp[B]);
		}
		chmax(&(dp[0]), dp[i] + A[i]);
	}
	printf("%lld\n", dp[0]);
	fflush(stdout);
	return 0;
}