#include <iostream>
using namespace std ;

class Demo
{
	public:
	static int z1 ;
	static void print()
	{
		cout << "z1:" << z1 << " " << x1 << endl ;
	}
	int  x1 ;
	int x2 ;
};

int Demo::z1 = 0 ;

int main()
{
	Demo obj1 ;
	obj1.x1 = 2 ;
	obj1.x2 = 3 ;
	obj1.z1 = 1 ;
	Demo obj2 ;
	obj2.x1 = 4 ;
	obj2.x2 = 5 ;
	obj1.z1 = 2 ;
	cout << obj1.x1 << " " << obj1.x2 << " " << obj1.z1 <<  endl ;
	cout << obj2.x1 << " " << obj2.x2 << " " << obj2.z1 << endl ;
	obj1.print() ;
	obj2.print() ;
	Demo::z1 = 100 ;
	Demo::print() ;
	return 0 ;

}