#include <iostream>
using namespace std;

class ICalculator
{
public:

	virtual int calculate(int x,int y) = 0;
};

class Adder : public ICalculator
{
public:  
	int Calculate(int x,int y)
{
	int s;
	s=x+y;
	return s;
}

};


class Multiplier : public ICalculator
{
public:
	int Calculate(int x, int y)
	{
		int m;
		m=x*y;
		return m;
	}
};

class Problem
{
private: int m_x ;
		 int m_y ;

		 ICalculator* m_pCalculator;

public:  int calculate();
		 setX(int);
		 setY(int);
		 setCalculator(ICalculator*);