#include <iostream>
using namespace std;
class B {
int x;
public:
B(int v) { v = x; }
int get_x() { return x; }
};
class D : private B {
int y;
public:
D(int v)
: B(v)
{
}
int get_x() { return x; }
};
int main()
{
D d(10);
cout << d.get_x();
}