import java.util.*;
public class Main{
    public  static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    String choice=sc.nextLine();
    switch (choice){
    case "Circle":
        double r=sc.nextDouble();
        System.out.printf("%.2f",Math.PI * r*r);
        break;
    case "Rectangle":
        double len=sc.nextDouble();
        double wid=sc.nextDouble();
        System.out.println("%.2f",len*wid);
        break;
    case "Square":
        double sidelen=sc.nextDouble();
        System.out.println("%.2f",sidelen*sidelen);
        break;
    default:
        System.out.println("Invalid input");
        break;

}}
}