import Control.Arrow
import Control.Monad
import Data.List
import qualified Data.ByteString.Char8 as B

main :: IO ()
main = replicateM 6 readLn >>= printRes . solve . reverse
    where
        printRes b
            | b = putStrLn "Yay!"
            | otherwise = putStrLn ":("

solve :: [Int] -> Bool
solve (k : xs) = check ds
    where
        ds = [ abs $ a - b | a <- xs, b <- xs ]
        check = not . any (> k)

readLine :: IO [Int]
readLine = unfoldr (fmap (second (maybe B.empty snd . B.uncons)) . B.readInt) <$> B.getLine

readContents :: Int -> IO [[Int]]
readContents = flip replicateM readLine