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")); } }