using System;

public class Program

{

    public static void Main()

    {

        int[] numbers = { 5, 3, 2, 7, 1, 8, 5, 16};

        int? max = null;

        for (int i = 0; i < numbers.Length; i++ ) 

        {

            double a = numbers [i] % 4;

            if (a==0) 

            {

                if (max == null)

                {

                    max = numbers[i];

                }

                else if (numbers [i] > max)

                {

                    max = numbers [i];

                }

            }

        }

        Console.WriteLine("max="+ max);

    }

}