abstract class RoundShape {
	
   protected class Center {
	int x,y;
   }
	
   protected Center C = new Center();
   protected float radiusOfCircle;

   public RoundShape(int xCenter, int yCenter, float radius) {		
	C.x=xCenter; 
	C.y=yCenter; 
	radiusOfCircle = radius;
   }
	
   abstract public float area();

}


class Circle extends RoundShape  {	
	
   public Circle(int xCenter, int yCenter, float radius) {
	super(xCenter, yCenter, radius);
   }
	
   public float area() {
	return (float)(Math.PI*Math.pow((double)radiusOfCircle,2.0));
   }
	
}

class Sphere extends RoundShape {
	
   public Sphere(int xCenter, int yCenter, float radius) {
	super(xCenter, yCenter, radius);
   }

   public float area() {
	return (float)(4.0*Math.PI*Math.pow((double)radiusOfCircle,2.0));
   }
	
}

class AbstractExample1 {
	
   public static void main(String[] args) {
	Circle c = new Circle(5,5,2.5f);
	Sphere s = new Sphere(5,5,2.5f);

	System.out.println("Area of the circle is " + c.area());
	System.out.println("Area of the sphere is " + s.area());
   }
}