using System;

public class Program {
	public void Solve() {
		string s = Console.ReadLine();
		if (s.Equals("0")) {
			Console.WriteLine(s);
		} else {
			Console.WriteLine(s + "0");
		}
	}
	
	public static void Main(string[] args) {
		Program program = new Program();
		program.Solve();
	}
}