using System;

using System.Collections.Generic;

using System.Data;

using System.Data.SqlClient;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

     enum Color : long

    {

        red = 1,

        black = 2,

        blue = 3,   

        ALL = 255

    }               

public class Program

{

     static private T GetMax<T>(Type type)

     {

           T maxValue = Enum.GetValues(type).Cast<T>().Max();

           return maxValue;

     }

    public static void Main()

    {

        Console.WriteLine(GetMax<long>(typeof(Color)));

    }

}