using System.Numerics;

public class Program
{
    public static void Main()
    {

        BigInteger num = BigInteger.Parse(Console.ReadLine() ?? string.Empty);
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split('/');
        //string str = Console.ReadLine() ?? string.Empty;


        BigInteger have = 0;
        int count = 0;
        while(num-have >= 100)
        {
            count++;
            have += 500;
        }
        Console.WriteLine(count);


    }

}