#!/usr/bin/python2
# -*- coding: utf-8 -*-
# †
n = int(raw_input())
y = map(int, raw_input().split())

def calc(height):
    res = 0
    for i in xrange(n):
        res += abs(height - y[i])
    return res

lo, hi = -10**9, 10**9

while hi - lo > 10:
    m1 = (lo + lo + hi) / 3
    m2 = (lo + hi + hi) / 3
    r1 = calc(m1)
    r2 = calc(m2)
    if r1 < r2:
        hi = m2
    else:
        lo = m1

mini = float('inf')
for x in xrange(lo, hi+1):
    mini = min(mini, calc(x))
print mini