using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;


class Magatro
{
    static long N = long.Parse(Console.ReadLine());
   static void Main() {
       long  cnt = 0;
        long year = N - 2014;
        long loop = year/400;
        long amari = year % 400;
        long a = 0;
        for(int i = 1; i <= 400; i++)
        {
            if (i%4==0)
            {
                if (1 % 400 == 0 || i % 100 != 0)
                {
                    cnt++;
                }
            }
            cnt++;
            if (cnt % 7 == 0) a++;
        }
        long ans = 0;
        ans += loop * a;
        cnt = 0;
        for(int i = 1; i <= amari; i++)
        {
            if (i % 4 == 0)
            {
                if (1 % 400 == 0 || i % 100 != 0)
                {
                    cnt++;
                }
            }
            cnt++;
            if (cnt % 7 == 0) ans++;
        }
        Console.WriteLine(ans);
    }
    
}