using System;

​

public class Product

{

    private double length;

    public double Length

    {

        get 

        {

            return length * 2.54;

        }

        set 

        {

            length = value / 2.54;

        }

    }

}

public class Program

{

    public static void Main()

    {

        var p = new Product();

        p.Length = 1;

        p.Length = p.Length + 1;

        Console.WriteLine(p.Length);

    }

}