#include <iostream>
using namespace std;
class cls1 {
protected:
int x;
public:
cls1() { x = 13; }
};
class cls2 : public cls1 {
int y;
public:
cls2() { y = 15; }
int f(cls2 ob) { return (ob.x + ob.y); }
};
int main()
{
cls2 ob;
cout << ob.f(ob);
return 0;
}