import java.util.Scanner;
public class Lab02_Task3B {
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        final double PI = 3.14159;
        double r = s.nextDouble(), h = s.nextDouble();
        double v = PI*r*r*h;
        System.out.println("Volume = "+String.format("%.2f",v)+" units square.");
    }
}