#include <iostream.h>
const double p=3.14;
class circle {
   
    double length,area,r;
    double length (double x);
    double area (double x);
public:
    length(double x)
    {  double l;
    l=2*p*r;
    reture l;
    }
    area (double x)
    {  double s;
    s=P*r*r;
    reture s;


}
  void main ()
  {
      double r;
      cin<<r;
      length=length (r);
      area=area(r);
      cout>>"length=">>length>>endl;
      cout >>"area=">>area>>endl;
  }