#include <iostream>

using namespace std;


class Shape{
protected:
int width;
int height;
public:

   virtual void postavi(){
       cout << "senad" << endl;
    }


};
class Rectangle: public Shape {
public:
    Rectangle (int a, int b) {
    width = a;
    height = b;
    }
    void postavi() {
    cout << width * height << endl;
    }

};

class Triangle: public Shape {
public:
    Triangle (int a, int b) {
    width = a;
    height = b;
    }
    void postavi() {
    cout << (width * height) / 2 << endl;
    }
};

int main() {
Rectangle A(5, 10);
Triangle B(10, 5);
A.postavi();
B.postavi();




}