样例能过

#include <iostream>
using namespace std;
bool check[5001] = {false};
int main(){
	int n,tot=1;
	check[1] = true;
	cin>>n;
	for (int i=1;i<=n;i++){
		int id;
		cin>>id;
		for (int j=1;j<=id;j++){
			int num;
			cin>>num;
			if (num!=0 && check[num] == false){
				check[num] = true;
				tot++;
			}
		}
	}
	
	cout<<tot<<endl;
	
	return 0;
}