#include <iostream>
using namespace std; 
class A 
{
    public :
    int x; 
    void getx ()
    {
        cout <<"Enter the value of x: ";
        cin >>x; 
        cout <<x<<endl; 
    }
};
class B :public virtual A 
{
    public :
    int y; 
    void gety()
    {
        cout <<"Enter the value of y: ";
        cin >>y; 
        cout <<y<<endl; 
    }
    void sum ()
    {
        cout <<"sum x+y= "<<x+y<<endl; 
    }
};
class C :public virtual A  
{
    public :
    int z; 
    void getz()
    {
        cout <<"Enter the value of z : ";
        cin >>z; 
        cout <<z<<endl; 
    }
    void sub ()
    {
        cout <<"sub x-z= "<<x-z<<endl; 
    }
};
class D :public B, public C 
{
    public :
    void add1 ()
    {
        cout <<"sum y+z= "<<y+z<<endl; 
    }
};
int main() {
    D obj; 
    obj. getx ();
    obj. gety ();
    obj. getz();
    obj. sum ();
    obj. sub();
    obj. add1();
    return 0;
}