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#include <bits/stdc++.h>
using namespace std;

// Interface
class TwoDimentionShapeInterface {
public:
  virtual double GetArea() = 0;
};

class ThreeDimentionShapeInterface {
public:
  virtual double GetArea() = 0;
  
  virtual double GetVolume() = 0;
};

// Client1
class Square : public TwoDimentionShapeInterface {
public:
  Square(int len) : len_(len) {}

  double GetArea() override { return len_ * len_; }

private:
  int len_;
};

// Client2
class Sphere : public ThreeDimentionShapeInterface {
public:
  Sphere(int radius) : radius_(radius) {}

  double GetArea() override {
    return 4 * 3.14 * radius_ * radius_;
  }

  double GetVolume() override {
    return 4 * 3.14 * radius_ * radius_ * radius_ / 3;
  }

private:
  int radius_;
};

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);

  Sphere sphere(2);
  cout << sphere.GetArea() << " " << sphere.GetVolume() << endl;

  Square square(5);
  cout << square.GetArea() << endl;

  return 0;
}
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