using System;
using System.Text;

public static class Program
{
    const int MAX = 100;
    static void Main(string[] args)
    {
        int N = int.Parse(Console.ReadLine());
        var sb = new StringBuilder();
        int num = 0;

        while (sb.Length <= MAX)
        {
            if (sb.Length >= MAX) break;
            sb.Append(num + 1);
            num++;
        }

        string C_10 = sb.ToString();
        Console.WriteLine(C_10[N-1]);
    }
} // class Program