#include <iostream>

class Zebra{
private:
	int x;
public:
	Zebra():x(0){}
	void addTwoToX();
	int getX(){return x;}
};
void main(){
	Zebra z;
	std::cout << z.getX() << std::endl;
	z.addTwoToX();
	std::cout << z.getX() << std::endl;	
}
void Zebra::addTwoToX(){
   x += 2;
}