import Control.Monad

main :: IO ()
main = do
    -- [a, x, y, z, b, k] <- map (read :: String -> Int) . words <$> getLine
    [a, _, _, _, b, k] <- getInts 6

    putStrLn $ if b - a > k then ":(" else "Yay!"

getLines :: Int -> IO [String]
getLines n = replicateM n getLine

getInts :: Int -> IO [Int]
getInts n = fmap read <$> getLines n