using System;
using System.Collections.Generic;
using System.Text;

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        long maxYear = long.Parse(Reader.ReadLine());

        long ans = this.CountAns(2015, Math.Min(maxYear, 2014 + 2800), 0);

        long per2800 = ans;

        if (maxYear > 2014 + 2800)
        {
            long year = 2014 + 2800;
            while (year + 2800 <= maxYear)
            {
                ans += per2800;
                year += 2800;
            }

            if (year < maxYear)
            {
                ans += CountAns(year + 1, maxYear, 0);


            }
        }
        Console.WriteLine(ans);


    }

    private long CountAns(long fromYear, long ToYear, int amari)
    {
        int ama = amari;
        int ans = 0;
        long year = fromYear;
        while (year <= ToYear)
        {
            bool isUru = false;
            if (year % 400 == 0)
            {
                isUru = true;
            }
            else if (year % 100 == 0)
            {
                isUru = false;
            }
            else if (year % 4 == 0)
            {
                isUru = true;
            }

            int days = 365 + ama;
            if (isUru)
            {
                days++;
            }
            ama = days % 7;
            if (ama == 0)
            {
                ans++;
            }
            year++;
        }
        return ans;

    }

    

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


3253406655




 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ', bool trim = false)
        {
            string inptStr = ReadLine();
            if (trim)
            {
                inptStr = inptStr.Trim();
            }
            string[] inpt = inptStr.Split(delimiter);
            int[] ret = new int[inpt.Length];
            for (int i = 0; i < inpt.Length; i++)
            {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}