import java.io.*;
public class Myjava{
  public static void main(String args[]){
    double c,s,p=3.14;
    byte r[]=new byte[50];
    String str;
    double R=0.0;
    try{
      System.in.read(r);
      str=new String(r,0);
      R=Double.parseDouble(str.trim());
      
    }catch(IOException e) {}
    c=2*p*R;
    s=p*R*R;
    System.out.println("c="+c);
    System.out.println("s="+s);
  }
}