class Test {
    public static void main(String[] args) {
        Point p1 = new Point(new Number(1), new Number(3));
        Point p2 = new Point(new Number(3), new Number(1));
        Rectangle r1 = new Rectangle(p1, p2);

        System.out.println(p1);
        System.out.println(p2);
        System.out.println(r1);
        System.out.println("the area of r1 is " + r1.area());

        Point p3 = new Point(new RationalNumber(1,1), new RationalNumber(3,1));
        Point p4 = new Point(new RationalNumber(3,1), new RationalNumber(1,1));
        Rectangle r2 = new Rectangle(p3, p4);

        System.out.println(p3);
        System.out.println(p4);
        System.out.println(r2);
        System.out.println("the area of r2 is " + r2.area());
    }
}

class Number {
    protected double value;
    
    public Number(double value) {
        this.value = value;
    }

    public String toString() {
        return String.valueOf(value);
    }

    public double getValue() {
        return value;
    }

    public Number minus(Number other) {
        return new Number(getValue() - other.getValue());
    }

    public Number times(Number other) {
        return new Number(getValue() * other.getValue());
    }

    public Number abs() {
        if (value > 0) {
            return new Number(-value);
        } else {
            return this;
        }
    }
    
    public String squee() {
      String s = "squee";
      for (int i = 0; i < value; i++) {
        s += "e";
      }
      return s;
    }
}

class Point {
    protected Number x;
    protected Number y;

    public Point(Number x, Number y) {
        this.x = x;
        this.y = y;
    }

    public Number getX() {
        return x;
    }

    public Number getY() {
        return y;
    }

    public String toString() {
        return "(" + x.toString() + "," + y.toString() + ")";
    }
}

class Rectangle {
    protected Point topleft;
    protected Point bottomright;

    public Rectangle(Point topleft, Point bottomright) {
        this.topleft = topleft;
        this.bottomright = bottomright;
    }

    public String toString() {
        return "[" + topleft.toString() + "," + bottomright.toString() + "]";
    }

    public Number area() {
        Number length_y = topleft.getY().minus(bottomright.getY()).abs();
        Number length_x = bottomright.getX().minus(topleft.getX()).abs();
        return length_y.times(length_x);
    }
}

/** NEW STUFF HERE **/
class RationalNumber extends Number {
    protected double numerator;
    protected double denominator;

    public RationalNumber(double numerator, double denominator) {
        super(numerator / denominator);
        this.numerator = numerator;
        this.denominator = denominator;
    }

    public double getValue() {
        return numerator / denominator;
    }
    
    public String toString() {
        return String.valueOf(numerator) + "/" + String.valueOf(denominator);
    }
}