import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.nextLine();

        if (s != "0") {
            System.out.println(s + "0");
        } else {
            System.out.println("0");
        }

        in.close();
    }
}