/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int ini=1900;
		int fin = 2001;
		int domingos = 0;
		long diasTotales=1;
		
		int[] meses = {31,28,31,30,31,30,31,31,30,31,30,31};
		
		for(int ano=ini;ano<fin;ano++){
			
			for(int mes=0;mes<meses.length;mes++){
				
				if(ano>1900){	
					if(diasTotales%7==0){
						domingos++;
						System.out.println(ano + " " + (mes+1));
					}
				}
				
				int dias=0;
				
				if(mes!=1 || ano%4!=0 || (ano%100==0 && ano%400!=0)){
					dias= meses[mes];
				}
				else{
					dias = 29;
					System.out.println(ano + " bisiesto");
				}
				
				diasTotales = diasTotales + dias;
			}
			
		}
		
		System.out.println(domingos);
	}
}