static void Main(string[] args)
        {
            Dictionary<string, int> dic = new Dictionary<string, int>();
            for (int i = 0; i < 5; i++)
            {
                /*your code to retrive the numbers*/
                if (!dic.ContainsKey(number))
                    dic.Add(number);
                dic[number]++;
            }
            Console.WriteLine(dic.Aggregate((l1, l2) => l1.Value > l2.Value ? l1 : l2).Key);
        }