package no87;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong() - 2014;
		int[] count = new int[400];
		count[0] = 1;
		int youbi = 0;
		for(int i=1;i<400;i++) {
			youbi = (youbi + (isUruu(2014+ i) ? 366 : 365)) % 7;
			count[i] = count[i-1] + (youbi == 0 ? 1 : 0);
		}
		long ans = 0;
		ans += (n / 400) * count[399];
		n %= 400;
		ans += count[(int) n%400];
		System.out.println(ans-1);
	}

	public static boolean isUruu(long y) {
		if (y%400 == 0) {
			return true;
		}else if(y%100 == 0) {
			return false;
		}else{
			return y%4 == 0;
		}
	}

}