using System;

public class Program

{

    public static void Main()

    {

        double R,p,s;

        Console.WriteLine("Enter R: ");

        R=int.Parse(Console.ReadLine());

        p=R*3.14 ;

        s=R/2*R/2*3.14 ;

        Console.WriteLine("P= {0}\nS= {1}",p,s);

    }

}