/*
 * Input: 
 * Output: 30
 */
#include <iostream>
using namespace std;

class Global{
private:
	static int number;
public:
	Global(){};
	static void setter(int a){
		number =a;
	}
	static int getter(){return number;}

};

int Global::number;

int main(){
	Global *a = new Global;
	Global *b = new Global;
	Global *c = new Global;
	a->setter(10);
	b->setter(20);
	b->setter(30);
	delete b,c;
	std::cout << a->getter() << std::endl;
	/* if put "static int number" in "public:",
	 * it can use "cout << Global::number << endl;" directly
	 */
	

	return 0;
}