using static System.Math;
using System.Linq;
using System.Collections.Generic;
using System;

public class Hello
{
    public static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        var d = new Dictionary<long, int>();
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        for (int i = 0; i < n; i++)
            if (d.ContainsKey(a[i])) d[a[i]]++;
            else d[a[i]] = 1;
        var ans = getAns(d, n);
        Console.WriteLine(ans);
    }
    public static long getAns (Dictionary<long,int> d , int n)
    {
        var count = 0;  var med = 0L;
        foreach (var x in d.OrderBy(y =>y.Key))
        {
            count += x.Value;
            if (count >= (n + 1) / 2) { med = x.Key; break; }
        }
        var ans = 0L;
        foreach (var x in d.OrderBy(y => y.Key))
            ans += x.Value * Abs(med - x.Key);
        return ans;
    }
}