import java.util.*;

class AreaCalculator {
    
    public double calculateArea(double radius) {
        if (radius<0 || radius>100)
        return-1;
        return Math.PI*radius*radius;
    }
    
    public double calculateArea(double length, double width) {
        if (length <0 || width <0 || length >100 || width>100)
          return-1;
        return length*width;
    }
    
    public double calculateArea(int side) {
        if(side <0 || side>100)
        return-1;
        return side*side;
    }
}
public class Main{
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        AreaCalculator ac = new AreaCalculator();
        
        try{
            String shape = SC.nextLine().trim().toLowercase();
            
            switch (shape) {
                case "Circle":
                    double radius = SC.nextDouble();
                    double circleArea = ac.calculateArea(radius);
                if(circleArea == -1) {
                    System.out.println("Invalid input");
                }
                else {
                    System.out.printf("%.2f", circleArea);
                }
                break;
                case "Rectangle": 
                    double length = SC.nextDouble();
                    double width = SC.nextDouble();
                    double rectArea = ac.calculateArea(length, width);
                    if(rectArea ==-1) {
                        System.out.println("Invalid input");
                    }
                    else {
                        System.out.printf("%.2f", rectArea);
                    }
                    break;
                    case "Square":
                        int side = SC.nextInt();
                        double squareArea = ac.calculateArea(side);
                          if(squareArea ==-1) {
                              System.out.println("Invalid input");
                          }
                          else {
                              System.out.printf("%.2f", squareArea);
                          }
                          break;
                    default:
                        System.out.println("Invalid input");
            }
        }
        catch(Exception e) {
            System.out.println("Invalid input");
        }
    }
}