#include <bits/stdc++.h>
using namespace std;


class Parent
{
    public:
        int num = 10;
        Parent(int num)
        {
            this->num = num;
        }
        void print()
        {
            cout << "Num: " << num << endl;
        }


        void add(Parent* pa)							// Base function
        {
            this->num += pa->num;
            cout << "Base func\n";
        }

};

class Child : public Parent
{
    public:
        Child(int num) : Parent(num) {}


        void add(Parent* pa)					// How to delete this
        {										//
            Parent::add(pa);					//
            cout << "Parent added\n";			//
        }										//
        void add(Child* pa)						// .. and keep this
        {
            Parent::add(pa);
            cout << "Child added\n";
        }

};

int main()
{
    Child* ch1 = new Child(20);
    Child* ch2 = new Child(5);
    Parent* pa2 = new Parent(4);

    ch1->add(ch2);							// Function 1
    ch1->print();

    cout << "\n";

    ch1->add(pa2);							// Function 2
    ch1->print();
}