#include <iostream>
using namespace std; 
class A 
{
    public :
    int x, y; 
    void getdata ()
    {
        cout <<"Enter the value of x and y: ";
        cin>>x>>y; 
        cout <<x<<" \t"<<y<<endl; 
    }
};
class B : public A 
{
    public :
    void product ()
    {
        cout <<"product xy= "<<x*y<<endl; 
    }
};
class C :public A 
{
    public :
    void sum()
    {
        cout <<"Sum x+y= "<<x+y<<endl; 
    }
};
class D:public B 
{
    public :
    int z; 
    void productz()
    {
        cout <<"Enter the value of z : ";
        cin >>z; 
        cout <<z<<endl; 
        cout <<"Result xyz= "<<x*y*z<<endl; 
    }
};
int main() {
     B o; 
    C o1;
    D o2;
    o. getdata ();
    o. product ();
    o1.getdata();
    o1.sum();
    o2.getdata();
    o2.product();
    o2.productz();
    return 0;
}