using System;

namespace lab22
{
    class Program
    {
        private static int[] arr;

        static void Main()
        {
            arr = new int[] {1,2,3,4,5,6,7,8,9,1,3,4,6,2,7,8};
            Console.WriteLine("Исходный массив:");
            foreach (int item in arr)
                Console.Write(item + " ");
            var difEl = new DifferentElements(arr);

            Console.WriteLine ("\n\nКоличество различных элементов в массиве = " + difEl.GetCount());
            Console.ReadKey();
        }
    }
    
    class DifferentElements
    {
        private int[] arr;
        private int countDiffVal;

        public DifferentElements(int[] arr)
        {
            this.arr = arr;
        }

        public int GetCount()
        {
            int len = arr.Length;
            int cnt = 0;
            
            for(int i = 0; i < len; i++)
            {
                for (int j = 0; j < len; j++)
                    if (arr[i] == arr[j])
                        cnt++;
                if (cnt < 2)
                    countDiffVal++;
                cnt = 0;
            }

            return countDiffVal;
        }
    }
}