using System;

public class Program

{

    public static int Task(int[] array) 

    {

        int length = array.Length;

        if (length == 0 || length == 1) 

        {

            return 0;

        }

        Array.Sort(array);

        Array.Reverse(array);

        int sum = 0;

        for (int ind = 0; ind < length - 1; ind++) 

        {

            sum = sum + (array[ind] - array[ind + 1]);

        }

        return sum;

    }

    public static void Main()

    {

        int result = Task(new int[3] {2, 1, 10});

        Console.WriteLine(result);

    }

}