using System;

namespace No021
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int k = int.Parse(Console.ReadLine());
            int[] num = new int[n];
            double max = 0.0, min = 1000.0;

            for (int i = 0; i < n; i++)
                num[i] = int.Parse(Console.ReadLine());

            for (int i = 0; i < n - 1; i++)
                for (int j = i + 1; j < n; j++)
                    Search(num, i, j, ref max, ref min);

            Console.WriteLine((int)Math.Ceiling(max - min));
        }

        static void Search(int[] num, int a, int b, ref double max, ref double min)
        {
            int sum = 0, count = 0;
            double ave;

            for (int i = 0; i < num.Length; i++)
            {
                if (i == a || i == b)
                    continue;

                sum += num[i];
                count++;
                ave = (double)sum / (double)count;

                if (max < ave)
                    max = ave;
                if (min > ave)
                    min = ave;
            }
        }
    }
}