using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        var inp = Console.ReadLine();
        if (inp.Length == 1)
        {
            Console.WriteLine(inp.PadLeft(3, '0'));
        }
        else if (inp.Length == 2)
        {
            Console.WriteLine(inp.PadLeft(1, '0'));
        }
        else
        {
            Console.WriteLine(inp);
        }
    }
}