#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000000

int main(){
	
	int N,K;
	cin>>N>>K;
	vector<long long> A(N),M(N);
	vector<vector<int>> B(N);
	rep(i,N){
		cin>>A[i]>>M[i];
		B[i].resize(M[i]);
		rep(j,M[i]){
			scanf("%d",&B[i][j]);
			B[i][j]--;
		}
	}
	
	vector<long long> dp(N+1,-Inf);
	dp.back() = 0;
	rep(i,N){
		dp[i] = dp.back()-A[i];
		rep(j,M[i]){
			dp[i] = max(dp[i],dp[B[i][j]]);
			dp.back() = max(dp.back(), dp[B[i][j]] + A[i]);
		}
	}
	
	cout<<dp.back()<<endl;
	
	return 0;
}