import Control.Applicative ((<$>))
import Control.Monad (replicateM)

main :: IO ()
main = do
  n <- getl read
  getLine
  solve <$> replicateM n (getl read) >>= print

solve :: [Int] -> Int
solve xs = maximum xs - minimum xs

getl :: (String -> a) -> IO a
getl f = f <$> getLine