package m.shin;
import java.util.Scanner;
public class Con552 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String str = s.nextLine();
		s.close();
		if(str == "0"){
			System.out.println("0");
		}else{
			System.out.println(str.concat("0"));
		}
	}

}