7

import java.util.*;


 class Dcoder
 {

  public static void main(String args[])
  {

   Scanner s=new Scanner();
    double r=s.nextdouble();
    double h=s.nextdouble();
    double c=abs(r,h);
     }


    public static double abc(int rr, int hh);
   {
    double cyl=3.14*3.14*rr*hh;
    return cyl;
   }

   }