using System;
using System.Linq;

namespace y
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int[] y = Console.ReadLine().Split().Select(x => int.Parse(x)).ToArray();
            Array.Sort(y);

            int c = 0;
            int d = 0;
            if (n == 1)
            {
                c = y[0];
                d = y[0];
            }
            else if (n % 2 == 0)
            {
                c = y[n / 2];
                d = y[n / 2 + 1];
            }
            else
            {
                c = y[n / 2];
                d = y[n / 2 + 1];
            }

            long ans1 = 0;
            long ans2 = 0;

            foreach (var i in y)
            {
                ans1 += Math.Abs(c - i);
                ans2 += Math.Abs(d - i);
            }

            Console.WriteLine((long)Math.Min(ans1, ans2));
        }
    }
}