using System;

​

public enum Days : byte 

{

    Monday = 1,

    Tuesday = 2,

    Wednesday = 3,

    Thursday = 4,

    Friday = 5,

    Saturday = 6,

    Sunday = 7

}

​

public class Program 

{

    public static void Main(string[] args) 

    {

        Console.WriteLine(Enum.GetUnderlyingType(typeof(Days)));

    }

}