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


namespace yukicoder
{
    class Program
    {

        static void Main(string[] args)//未完成
        {


            string d = Console.ReadLine();

            if (d == "0")
            {
                Console.WriteLine(d);
            }
            else
            {
                
                Console.WriteLine(d + "0");
            }

        }
    }
}