# -*- coding: utf-8 -*-
"""
No.609 Noelちゃんと星々
https://yukicoder.me/problems/no/609

"""
import sys
from sys import stdin
input = stdin.readline


def calc_score(n, stars):
    res = [abs(x - n) for x in stars]
    return sum(res)


def solve(stars):
    ans = float('inf')
    ub = max(stars)
    lb = min(stars)

    ub_score = calc_score(ub, stars)
    lb_score = calc_score(lb, stars)
    while ub > lb + 1:
        mid = (ub + lb) // 2
        mid_score = calc_score(mid, stars)

        if ub_score >= mid_score:
            ub = mid
            ub_score = mid_score
        elif lb_score >= mid_score:
            lb = mid
            lb_score = mid_score
    return min(ub_score, lb_score)


def main(args):
    N = int(input())
    stars = [int(x) for x in input().split()]
    ans = solve(stars)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])