using System;
using System.Linq;
using System.Collections.Generic;

public class Test
{
    
    static int counter = 0;
    
    public static IEnumerable<T> CountedEnum<T>(IEnumerable<T> ee) {
        foreach (var e in ee) {
            counter++;
            yield return e;
        }
    }
    
    public static void Main() {
        var Numbers= CountedEnum(new int[5]{5,2,3,4,5});
        var query =  from a in Numbers
            where a== Numbers.Max (n => n)
            select a;

        foreach (var element in query)
            Console.WriteLine (element);
        
        Console.WriteLine("Count: {0}", counter);
    }
}