#include <iostream>

using namespace std;

struct ListItem{
	int value;
	ListItem* next;
};

ListItem* StackTop = NULL;

int stack_pop(){
	int tmp = StackTop->value;
	StackTop = StackTop->next;
	return tmp;
}

void stack_push(int v){
	ListItem* ni = new ListItem;
	ni->value = v;
	ni->next = StackTop;
	StackTop = ni;
}

int main(int argc, char * argv[])
{
	stack_push(2);
	stack_push(1);

	cout << stack_pop() << endl;
	cout << stack_pop() << endl;

	return 0;
}