#include <iostream>
using namespace std; 
class student 
{
    public:
    int m1,m2,m3,rollno;
    char name[30];
     void getdata ()
    {
        cout <<"Enter the roll no:";
        cin >>rollno;
        cout <<rollno<<endl; 
        cout <<"Enter the name :";
        cin>>name; 
        cout <<name <<endl; 
        cout <<"Enter the three marks :";
        cin >>m1>>m2>>m3;
        cout <<m1<<" "<<m2<<" "<<m3<<endl; 
    }
};
class mark :public student 
{
    public:
    int total; 
    float avg; 
 
    void calculation  ()
    {
        total =m1+m2+m3;
        avg=total/3;
    }
    void display ()
    {
        cout <<"Total= "<<total<<endl; 
        cout <<"Average = "<<avg<<endl; 
    }
};
int main() {
    mark m; 
    m. getdata ();
    m. calculation ();
    m. display ();
    return 0;
}