using System;
using System.Text;

class Program
{
    public void Solve()
    {
        int D = int.Parse(Console.ReadLine());
        var C = new StringBuilder();
        for (int i = 1; ; i++)
        {
            C.Append(i.ToString());
            if (D <= C.Length) { break; }
        }
        Console.WriteLine(C.ToString().Substring(D-1, 1));
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}