import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Tester {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder(br.readLine());
		if(sb.length() != 0)
		System.out.println(sb.append("0"));
	}
}