{-# LANGUAGE FlexibleContexts, OverloadedStrings #-}
import Control.Applicative
import Control.Monad
import qualified Data.ByteString.Char8 as B
import Data.Maybe (fromJust)
import Text.Printf
import Debug.Trace

f ys y = foldl (\a b -> a + abs (y-b)) 0 ys

main = do
  _ <- getInts
  xs <- getInts
  print $ tri (f xs) (-1000000010) 1000000010

-- util
getInts :: IO [Integer]
getInts = map (fst . fromJust . B.readInteger) . B.words <$> B.getLine

tri f lb ub
  | ub-lb < 3 = minimum [f x | x <- [lb .. ub]]
  | otherwise = if y1 < y2 then tri f lb x2
                else tri f x1 ub
  where
    (x1,x2) = ((lb*2 + ub) `div` 3, (lb + ub*2) `div` 3)
    (y1,y2) = (f x1, f x2)