import qualified Data.Text as T
import qualified Data.Text.IO as T
import qualified Data.Text.Read as T

main :: IO ()
main = do
  (n : _) <- map unsafeTextToInt . T.words <$> T.getLine :: IO [Int]
  xs <- map unsafeTextToInt . T.words <$> T.getLine :: IO [Int]
  let
    m :: Int
    m = round $ toRational (sum xs) / toRational n
  print . sum . map (^ 2) . map (subtract m) $ xs

unsafeTextToInt :: T.Text -> Int
unsafeTextToInt s = case T.signed T.decimal s of
  Right (n, _) -> n
