using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Count(new int[] { 1, 1, 1, 2, 3, 3, 4 }));

    }

    public static int Count(int[] arr)

    {

        int count = 0;

        Array.Sort(arr);

        for ( int i = 0; i < arr.Length - 1; i++ )

        {

            if( arr[i] == arr[i+1] )

                continue;

            else

                count++;

        }

        return count;

    }

}