main = do
    [a,b,c,d,e,k] <- map read . lines <$> getContents :: IO [Int]
    putStrLn $ if (or . map (>k))
        [x | x<-[1..122], y<-[a,b,c,d,e], z<-[a,b,c,d,e], x==abs(y-z)]
            then ":("
            else "Yay!"