using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Calculate(new Figure()));

        int Calculate(Figure figure) => figure.PI switch {

                >1 and <2 =>  2,

                >= 2 => 4,

                _ => 6

        };

    }

    class Figure

    {

        public float PI = 4.14f;

    }

    class Rectangle : Figure

    {

    }

}