using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static List<string> enums = ["Enum1", "Enum2", "Enum3", "Enum4", "Enum5", "Enum6", "Enum7", "Enum8", "Enum9"];

    public static string/*List<string>*/ findFromNum(List<string> en, int num){

        List<string> res=new List<string>();

        for (int i=0; i<en.Count(); i++){

            if (Convert.ToBoolean( (num >> i) & 1 ) )

                res.Add(en[i]);

        }

        //для удобства

        return String.Join(' ', res) ;

    }

    public static void Main()

    {

        Console.WriteLine( findFromNum(enums, 7) );

    }

}