// editor1
import java.util.*;
public class shape{
    void area(double r){
       System.out.printf("%.2f%n",Math.PI*r*r);
       return;
    }
   
    void area(int l,int w){
        System.out.println("%.2f%n",l*w);
        return;
    }
    
    
    void area(float a){
        System.out.println("%.2f%n",a*a);
        return;
    }
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String type =sc.nextLine();
        shape sp =new shape();
        if(type.equals("Circle")){
            double r =sc.nextDouble();
            if(r<0){
                System.out.println("Invalid input");
                return;
            }
            sp.area(r);
        }
        else if(type.equals("Rectangle")){
            int l =sc.nextInt();
            int w =sc.nextInt();
            if(l<0 || w<0){
                System.out.println("Invalid input");
                return;
            }
            sp.area(l,w);
        }
        else if(type.equals("Square")){
            float a=sc.nextFloat();
            if(a<0){
                System.out.println("Invalid input");
                return;
            }
            sp.area(a);
        }
        else{
            System.out.println("Invalid input");
                return;
        }
    }
}