public class Shape
{	public double Area() { return 0; }
}

class Circle extends Shape
{	public Circle(double r) { radius = r; }	
	
	public double Area() { return 3.14*radius*radius; }
	
	private double radius;
}

class Square extends Shape
{	public Square(double l) { length = l; }

	public double Area() { return length*length; }
		
	private double length;
}