import java.util.*;
public class Main {
	public static void main(String[] args) {
		long n=new Scanner(System.in).nextLong()-2014;
		long i,r=57*(n/400);
		for(i=15;i<n%400+16;i++)if((5*(i%100)/4+21*(i/100)/4)%7==3)r++;
		System.out.println(r);
	}
}