How to an Enumeration, Days, is declared in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace enumDaysByName
{
    enum DaysByName
    {
        Sunday = 1, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
    }
    class Enum
    {
        static void Main(string[] args)
        {
            DaysByName today = DaysByName.Sunday;
            Console.WriteLine("Today is : {0}", today);
            Console.WriteLine("5 * 7 = {0}", (int) DaysByName.Thursday * (int) DaysByName.Saturday);
        }
    }
}

4 * 6 = 35