Dojo1_1

struct Node
{
  Node(Node* next = nullptr, int value = 0);

  Node(Node* const&);

private:
  Node* next;
  int value;
};

struct Stack
{
  Stack();

  Stack(Stack const&);

  ~Stack();

  void add(int value);

  Node* remove();

  int get_stack_size();

private:
  Node* top;
};