#include <iostream>
    using namespace std;
    class Base 
    {
        int K;
        public:
        void setInt(int num);
        int getInt();
    };
    class Derived : public Base
    {
        int L;
        public:
        void setL(int num);
        int multiply();
    };
    void Base::setInt(int num)
    {
        K = num;
    }
    int Base::getInt()
    {
        return K;
    }
    void Derived::setL(int num)
    {
        L = num;
    }
    int Derived::multiply()
    {
        return L * getInt();
    }
    int main()
    {
        Derived object;
        object.setInt(12);       
        object.setL(3);          
        cout << object.multiply();    
        return 0;
    }