public class Test {
    public static void main(String[] args) {

    }
}

abstract class Shape {

    abstract double getPerimeter();

    abstract double getArea();

}

class Square extends Shape {
    private double sideABCD;

    public double getSideABCD() {
        return sideABCD;
    }

    Square(double sideABCD) {
        this.sideABCD = sideABCD;
    }

    @Override
    public double getPerimeter() {
        return sideABCD * 4;
    }

    @Override
    public double getArea() {
        return sideABCD * sideABCD;
    }
}

class Triangle extends Shape {
    private double sideA;
    private double sideB;
    private double sideC;

    public double getSideA() {
        return sideA;
    }

    public double getSideB() {
        return sideB;
    }

    public double getSideC() {
        return sideC;
    }

    Triangle(double sideA, double sideB, double sideC) {
        this.sideA = sideA;
        this.sideB = sideB;
        this.sideC = sideC;
    }

    @Override
    public double getPerimeter() {
        return sideA + sideB + sideC;
    }

    @Override
    public double getArea() {
        return sideA * sideB / 2;
    }
}

class Box extends Shape {
    private double sideA;
    private double sideB;

    public double getSideA() {
        return sideA;
    }

    public double getSideB() {
        return sideB;
    }

    Box(double sideA, double sideB) {
        this.sideA = sideA;
        this.sideB = sideB;
    }

    @Override
    public double getPerimeter() {
        return 2 * (sideA + sideB);
    }

    @Override
    public double getArea() {
        return sideA * sideB;
    }
}