#include <iostream>
using namespace std;
class A{
    int x=10;
    int y=20;
};
class B:public A{
    // cout<< y;
    cout<<x
};
class C:public B{
    void display(){
        cout<<x;
    }
};
int main(){
    C,c1;
    c1.display();
    return 0;
}