using System;

using System.Collections.Generic;

​

public partial class Program

{

    public static void Main()

    {/*

        Sample:

        3 4

        3 1 2 3

        1 1

        1 2

*/

        var line = Console.ReadLine();

        var tokens = line.Split(' ', '\t');

        var T = int.Parse(tokens[0]);

        var H = int.Parse(tokens[1]);

        var tickets = new List<Ticket>();

        for(int j=0; j<T; j++)

        {

            line = Console.ReadLine();

            tokens = line.Split(' ', '\t');

            var h = int.Parse(tokens[0]);

            var hotels = new List<int>();

            for(int k=1; k<=h; k++){                

                hotels.Add(int.Parse(tokens[k]));

            }

            tickets.Add(new Ticket(hotels));        

        }

        var hotelsToPayFor = Solution.CountPaidHotels(tickets, H);

        Console.WriteLine(hotelsToPayFor);

    }

}

​

public class Ticket

{

    public Ticket(List<int> hotels) { this.Hotels = hotels; }

    public List<int> Hotels;

}

​

public class Solution

{

    private static Dictionary<int,List<int>> CreateReverseLookup(List<Ticket> tickets)

    {

        throw new NotImplementedException();

    }

    public static int CountPaidHotels(List<Ticket> tickets, int numHotels)

    {       

        // RemoveUselessTickets(tickets, hotels);

        var reverse = CreateReverseLookup(tickets);

        var payHotels = numHotels; 

        var removed = new HashSet<int>();

        for(int j=tickets.Count-1; j>=0; j--) { 

            var ticket = tickets[j];

          if(ticket.Hotels.Count==1) { 

              var h = ticket.Hotels[0];

            removed.Add(j); //tickets.RemoveAt(j);

            --payHotels;

            var uList = reverse[h];

            foreach(var u in uList) {  

                if(!removed.Contains(u)) { 

                     tickets[u].Hotels.Remove(h);

                     if(tickets[u].Hotels.Count==0) {

                         removed.Add(u); /*tickets.RemoveAt(u);*/ 

                     } 

                }                        

            }                   

          }

       }

       // Now tickets has only the remaining tickets that point to multiple hotels

       /*for(int r=0; r<tickets.Count; r++) {•     if(!removed.Contains(r)) { --payHotels; }

        }*/

        //OR: var diff = tickets.Count - removed.Count; payHotels-=diff;

        var diff = tickets.Count - removed.Count;

        payHotels -= diff;

        return payHotels;

​

    }

}

public partial class Program

{

    public static void testCases()

    {

        Console.WriteLine("Hello World");

    }

}