import java.io.*;
import java.util.Scanner;
public class q5
{
	public static void main(String[]args) throws IOException
	{
		String line;
		int copies[]= new int[5];
		File data = new File("DATA5.txt");
		FileReader in = new  FileReader (data);
		BufferedReader read = new BufferedReader (in); 
		Scanner input = new Scanner(in);
		
		for (int a=0; a<5; a++)
		{
			int numline=Integer.parseInt (input.nextLine());
			int number[]=new int[(numline+1)*2];
			String lines[]=new String[numline+1];
			for (int b=0; b<numline; b++)
			{
				String tempnum[];
				lines[b]=input.nextLine();
				tempnum=lines[b].split(" ");
				number[2*b]=Integer.parseInt (tempnum[0]);
				number[2*b+1]=Integer.parseInt (tempnum[1]);
			}
			lines[numline]=lines[0];
			String temp[];
			temp=lines[numline].split(" ");
			number[2*(numline)]=Integer.parseInt (temp[0]);
			number[2*(numline)+1]=Integer.parseInt (temp[1]);
			for (int c=0; c<(numline); c++)
			{
				if (number[c*2+1]==number[c*2+2])
				{
					copies[a]++;
				}
				else if ((!(number[c*2+1]==number[c*2+2])) && (copies[a]>0))
				{
					copies[a]++;
					break;
				}
			}
		System.out.println(copies[a]);		
		}
	
		
		//writing
		File data2 = new File("OUT5.txt");
		FileWriter out = new FileWriter(data2);
		BufferedWriter writes = new BufferedWriter (out);
		for (int q = 0; q<5; q++)
		{
			writes.write(String.valueOf(copies[q]));
			writes.newLine();
		}
		writes.close();
		out.close(); 
	}
}