import Control.Applicative
import Data.List

main :: IO ()
main = solve <$> readLn <*> readLn >>= print

solve :: Int -> Int -> Int
solve a b = foldr g 0 $ unfoldr f $ a + b
  where
    f x = if x == 0 then Nothing else Just $ let (q, r) = x `divMod` 10 in (r, q)
    g x z = z * 2 + (if x == 1 then 1 else 0)