using System;

public class Program

{

    public static void Main()

    {

        ulong deliveredRecipientCount = 40;

        ulong bouncedRecipientCount = 20;

        int totalRecipientCount = 200;

        var result = (deliveredRecipientCount + bouncedRecipientCount) * 1.0D / totalRecipientCount;

        Console.WriteLine(result);

    }

}