using System;

public class Hello
{
    static void Main()
    {
        var t = 0;
        for (int i = 2000; i <= 2014; i++) t += check(i);
        var t2014 = t % 7;

        var n = long.Parse(Console.ReadLine().Trim());
        if (n <= 2399) Console.WriteLine(calcDays(2015, (int)n, t2014, t2014));
        else
        {
            long ans = calcDays(2015, 2399, t2014, t2014);
            var box = calcDays(2000, 2399, t2014);
            ans += (n / 400L - 2014 / 400L - 1) * box;
            ans += calcDays((n / 400L) * 400L, n, t2014);
            Console.WriteLine(ans);
        }
    }
    static int calcDays(long from, long to, int t2014, int start = 0)
    {
        var res = 0;
        var t = start;
        for (long i = from; i <= to; i++)
        {
            t += check(i);
            t %= 7;
            if (t == t2014) res++;
        }
        return res;
    }
    static int check(long y)
    {
        if (y % 400 == 0) return 2;
        else if (y % 100 == 0) return 1;
        else if (y % 4 == 0) return 2;
        else return 1;
    }
}