using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class TEST{
	static void Main(){
		Sol mySol =new Sol();
		mySol.Solve();
	}
}

class Sol{
	public void Solve(){
		Console.WriteLine("ok");
		HashSet<int> hs = new HashSet<int>();
		for(int i=0;i<M;i++) hs.Add(G[i]);
		HashSet<int> must = new HashSet<int>();
		for(int i=1;i<=N;i++) if(!hs.Contains(i)) must.Add(i);
		
		
		while(true){
			bool update = false;
			for(int i=0;i<M;i++){
				if(must.Contains(G[i])) continue;
				bool chk = true;
				for(int j=0;j<R[i];j++) chk &= must.Contains(H[i][j]);
				if(chk){
					update = true;
					must.Add(G[i]);
				}
			}
			if(!update) break;
		}
		
		Console.WriteLine(must.Count);
		
		
		
	}
	int N,M;
	int[] G,R;
	int[][] H;
	public Sol(){
		var d = ria();
		N = d[0]; M = d[1];
		G = new int[M];
		R = new int[M];
		H = new int[M][];
		for(int i=0;i<M;i++){
			d = ria();
			G[i] = d[0]; R[i] = d[1];
			H[i] = ria();
		}
	}

	static String rs(){return Console.ReadLine();}
	static int ri(){return int.Parse(Console.ReadLine());}
	static long rl(){return long.Parse(Console.ReadLine());}
	static double rd(){return double.Parse(Console.ReadLine());}
	static String[] rsa(char sep=' '){return Console.ReadLine().Split(sep);}
	static int[] ria(char sep=' '){return Array.ConvertAll(Console.ReadLine().Split(sep),e=>int.Parse(e));}
	static long[] rla(char sep=' '){return Array.ConvertAll(Console.ReadLine().Split(sep),e=>long.Parse(e));}
	static double[] rda(char sep=' '){return Array.ConvertAll(Console.ReadLine().Split(sep),e=>double.Parse(e));}
}