What will be the output of the program?

#include <iostream>
using namespace std;
class A { public: int n = 10; };
class B : virtual public A {};
class C : virtual public A {};
class D : public B, public C {};
int main() {
    D d;
    d.n = 5;
    cout << d.B::n + d.C::n << endl;
    return 0;
}