#include <iostream>
using namespace std;

//Base class
class Person
{
protected:
    double sum;
};

class Employee : protected Person {
public:
    void Add(double input)
    {
        sum += input;
        cout << "The sum after adding is " << sum << endl;
    }

    void Substract(double input)
    {
        sum -= input;
        cout << "The sum after substracting is " << sum << endl;
    }
};

int main()
{

    Employee Empl;
    Empl.Add(12);
    Empl.Substract(10);
    return 0;
}