import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        
        String shape=sc.nextLine();
        
        if(shape.equals("Circle"))
        {
            double radius=sc.nextDouble();
            if(radius<0)
            {
                System.out.println("Invalid input");
                return;
            }
            double area=3.14159*radius*radius;
            System.out.printf("%.2f",area);
        }
        else if(shape.equals("Rectangle"))
        {
            double length=sc.nextDouble();
            double width=sc.nextDouble();
            if(lenght<0||width<0)
            {
                System.out.println("Invalid input");
                return;
            }
        }
        else if(shape.equals("Square"))
        {
            double side=sc.nextDouble();
            if(side<0)
            {
                System.out.println("Invalid input");
                return;
            }
            double area=length*width;
            System.out.printf("%.2f",area);
        }
        else
        {
            System.out.println("Invalid input");
        }
    }
}