#include <iostream>
using namespace std;
class first
{
    public:
    int n1,n2;
    void getdata()
    {
        cout<<"\n The value of No.1 : ";
        cin>>n1;
        cout<<"\n The value of No.2 : ";
        cin>>n2;
    }
};
class second:public first
{
    public:
    int tot;
    void add()
    {
        tot=n1+n2;
    }
};
class thrid:public second
{
    int n3,z;
    public:
    void indata()
    {
        cout<<"\n The value of No.3 : ";
        cin>>n3;
    }
    void sub()
    {
        z=tot-n3;
    }
    void display()
    {
        cout<<"\n The value of No.1 : "<<n1;
        cout<<"\n The value of No.2 : "<<n2;
        cout<<"\n The Total (No.1 + No.2) : "<<tot;
        cout<<"\n The value of No.3 : "<<n3;
        cout<<"\n The Subtraction (Total - No.3) : "<<z;
    }
};
int main()
{
    thrid t;
    t.getdata();
    t.add();
    t.indata();
    t.sub();
    t.display();
    return 0;
}