public class Point extends Pair{
    public Point (int xx, int yy){
	super (xx,yy);
    }
    public String toString(){
	return "Point[" + x + "," + y + "]";
    }
    public double distance(){
	return Math.sqrt(x*x + y*y);
    }
    public double distance(Point p){
	return Math.sqrt((x-p.x)*(x-p.x) + (y-p.y)*(y-p.y));
    }
}