#include <iostream>
    using namespace std;
    class PolygonShape 
    {
        protected:
        int W, H;
        public:
        void set_values (int num1, int num2)
        { 
            W = num1; H = num2;}
        };
        class outputA 
        {
            public:
                void output (int k);
        };
    void outputA::output (int k) 
    {
        cout << k << endl;
    }
    class RectangleShape: public PolygonShape, public outputA 
    {
        public:
        int Area ()
        { 
            return (W * H); 
        }
    };
    class triangleShape: public PolygonShape, public outputA 
    {
        public:
        int Area()
        {
            return (W * H / 2); 
        }
    };
    int main () 
    {
        RectangleShape RectObject;
        triangleShape TrgObject;
        RectObject.set_values (3, 4);
        TrgObject.set_values (3, 4);
        RectObject.output (RectObject.Area());
        TrgObject.output (TrgObject.Area());
        return 0;
    }