import Control.Monad
import Data.Maybe
import qualified Data.ByteString.Char8 as BS
import Data.List

readInt = fst . fromJust . BS.readInt
readIntList = map readInt . BS.words
getInt = readInt <$> BS.getLine
getIntList = readIntList <$> BS.getLine

main = do
    [a, b, c] <- getIntList
    putStrLn . solve $ a + b + c

solve n | n >= 22 = "bust"
        | otherwise = "win"