import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();
		if(N.equals("0")) {
			System.out.println(N);
			System.exit(0);
		}
		System.out.println(N + "0");
	}
}