#!/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