using System;

public class Program

{

    public static int Difference(int[] a)

    {

        Array.Sort(a);

        int maxElement = a[a.Length-1];

        int minElement = a[0];

        return maxElement - minElement;

    }

    public static void Main()

    {

        int[] test = {3,2,9,5};

        int[] test2 = {1,1,1,1};

        Console.WriteLine("{0}", Difference(test2)); 

    }

}