#include <iostream>
#include <memory>

using namespace std;

int main()
{
	std::shared_ptr<int> p1 = nullptr;
	if(p1)
	{
		std::cout << "p1 != nullptr" << std::endl;
	}
	else
	{
		std::cout << "p1 == nullptr" << std::endl;
	}
	
	return 0;
}