class Counter {
protected:
  unsigned int count;
public:
  Counter() :count(0) {}

  Counter(int value) :count(value) {}

  unsigned int get_count() const {
    return count;
  }

  Counter operator++() {
    return Counter(++count);
  }
};

class CountDn : public Counter {
public:
  CountDn() :Counter() {}
  CountDn(int value) :Counter(value) {}

  CountDn operator--() {
    return CountDn(--count);
  }
};

class CountInhetirance :public CountDn {
public:
  CountInhetirance():CountDn(){}
  CountInhetirance(int value) :CountDn(value) {}

  CountInhetirance operator--(int) {
    return CountInhetirance(count--);
  }
  CountInhetirance operator++(int) {
    return CountInhetirance(count++);
  }
};