import java.util.Scanner;
public class Ssd{
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
int aaa=s.nextInt();
System.out.println(aaa*aaa);
}
}

import java.util.Scanner;
public class Ssd{
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
int aaa=s.nextInt();
if(aaa>=100&&aaa<=999){ System.out.println((aaa/100)*(aaa%100/10)*(aaa%10));
}
else{
System.out.println("输入数据错误");
}
}
}