using System;

public delegate void del(double x, out double rez);

​

public class Program

{public static void Arie(double x, out double rez)

{ rez=x*x*System.Math.PI;

}

 public static void Lungime(double x, out double rez)

 { rez=2*x*System.Math.PI;

 }

 public static void afis(double x,out double rez)

 { rez=0;

  Console.WriteLine(x);

 }

    public static void Main()

    {double r=double.Parse(Console.ReadLine()),rez;

     del c=new del(afis);

        c+=Lungime;

     Console.Write("Raza: ");

     c( r, out rez);

     Console.WriteLine("Lungime: {0:#.##}",rez);

     c-=Lungime;

     c+=Arie;

     c-=afis;

     c( r,out rez);

         Console.WriteLine("Aria: {0:#.##}",rez);

    }

}