package yukicoder;

import java.util.Scanner;

public class N552 {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		if(str.equals("0")){
			System.out.println(0);
		}else{
			System.out.print(str);
			System.out.print(0);
		}
	}
}