import qualified Data.ByteString.Char8 as BSC8
import qualified Data.Maybe            as Maybe

readIntegers :: IO [Integer]
readIntegers = map ( fst . Maybe.fromJust . BSC8.readInteger ) . BSC8.words <$> BSC8.getLine

main :: IO ()
main = do
  (a:b:c:_) <- readIntegers
  if (c - a - b) ^ 2 > 4 * a * b then putStrLn "Yes"
                                 else putStrLn "No"