import java.util.*;
import static java.lang.Math.*; 
public class ppp {
			
  public static void main(String[] args) {
	  Scanner sc=new Scanner(System.in);
	  long n=sc.nextLong()-2014;
	  long amari=n-(n/400)*400;
	  long ans=57*(n/400);
	  for(int i=2015;i<=2014+amari;i++){
		  Calendar c = new GregorianCalendar(i, 7-1, 23);
		  if(c.get(Calendar.DAY_OF_WEEK)==4)ans++;
	  }
	  System.out.println(ans);
  }}