#include <iostream>
using namespace std;
class Elem {
public:
    int *num;
    Elem * prev;
};

class Stack {
    Elem * top;
    int arr;
public:
    Stack() :arr(0) { top = new Elem; top->num = new int; };
    void push(int n){
        top->num[arr++] = n;
    }
    int pop(){
        return top->num[--arr];
    }
    ~Stack()
    {
    }
};

int main()
{
    Stack obj;
    obj.push(23);
    obj.push(44);
    obj.push(55);
    cout << obj.pop() << endl;
    cout << obj.pop() << endl;
    cout << obj.pop() << endl;
}