using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string num = "0";
            for(int i=1;i<=100;i++)
            {
                num = num + i.ToString();
            }
            int d = int.Parse(Console.ReadLine());
            Console.WriteLine(num.Substring(d, 1));
        }
    }
}