using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;


class Program
{
    static void Main()
    {
        var input = Console.ReadLine();
        if (input == "0")
        {
            Console.WriteLine("0");
        }
        else
        {
            Console.WriteLine(input + "0");
        }
    }
}