class A {
private:
  const int x;

public:
  A(int _x) : x(_x) {
  }

  inline int getX() const {
    return x;
  }
} ;

class B : public A {
private:
  const int y;

public:
  B(int _x, int _y) : A(_x), y(_y) {
  }

  inline int getY() const {
    return y;
  }
} ;