#include <iostream>
using namespace std;
class cls{
public:
	static int x;
	cls()
	{
		x++;
		cout<<x<<"-\n";
	}
	~cls()
	{
		cout<<"destruct"<<x--<<"\n";
	}
};

int cls::x=0;
void f(cls &a)
{
	cls c;
	cout<<a.x<<"+\n";
	return ;
}

int main()
{
    cls r;
    cout<<r.x<<"=\n"; 
    f(r);
	return 0;
}