using System;

public class Program

{

    public static void Main()

    {

        const double PI = 3.14159;

        double area = 0.0;

        double radi = 0.0;

        double perimetre = 0.0;

        Console.WriteLine("pon el radio de la circurferencia");

        radi = Convert.ToDouble( Console.ReadLine());

        area = Math.PI * radi * radi;

        perimetre = 2 * PI * radi;

        Console.WriteLine("El perimetro es: "+ perimetre);

        Console.WriteLine(" el area : "+ area);

    }

}