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

main :: IO ()
main = do
  (h : _) <- map unsafeSignedDecimal . T.words <$> T.getLine :: IO [Int]
  (w : _) <- map unsafeSignedDecimal . T.words <$> T.getLine :: IO [Int]
  (n : _) <- map unsafeSignedDecimal . T.words <$> T.getLine :: IO [Int]
  let
    m = max h w
  print . ceiling $ toRational n / toRational m

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