{-# LANGUAGE BangPatterns #-}

import           Control.Monad
import           Data.IORef
import qualified Data.Vector.Fusion.Stream.Monadic as VFSM
import qualified Data.Vector.Unboxed               as VU
import qualified Data.Vector.Unboxed.Mutable       as VUM

maxv :: Int
maxv = 30
{-# INLINE maxv #-}

main :: IO ()
main = do
  [v0, v1, v2, v3] <- map (read :: String -> Int) . words <$> getLine
  ans <- newIORef (10000 :: Int)
  rep1 maxv $ \a -> repM (a + 1) maxv $ \b -> repM (b + 1) maxv $ \c -> do
    dp <- VUM.replicate (maxv + 1) (10000 :: Int)
    VUM.unsafeWrite dp 0 (0 :: Int)
    ks <- VU.unsafeThaw $ VU.fromList [a, b, c]
    rep 3 $ \i -> rep' maxv $ \j -> do
      ki <- VUM.unsafeRead ks i
      when (j + ki <= maxv) $ do
        dpj <- VUM.unsafeRead dp j
        VUM.modify dp (min (dpj + 1)) (j + ki)
    item0 <- VUM.unsafeRead dp v0
    item1 <- VUM.unsafeRead dp v1
    item2 <- VUM.unsafeRead dp v2
    item3 <- VUM.unsafeRead dp v3
    modifyIORef' ans (min (item0 + item1 + item2 + item3))
  print =<< readIORef ans

stream :: Monad m => Int -> Int -> VFSM.Stream m Int
stream !l !r = VFSM.Stream step l
  where
    step x
      | x < r     = return $ VFSM.Yield x (x + 1)
      | otherwise = return $ VFSM.Done
    {-# INLINE [0] step #-}
{-# INLINE [1] stream #-}

rep :: Monad m => Int -> (Int -> m ()) -> m ()
rep n = flip VFSM.mapM_ (stream 0 n)
{-# INLINE rep #-}

rep' :: Monad m => Int -> (Int -> m ()) -> m ()
rep' n = flip VFSM.mapM_ (stream 0 (n + 1))
{-# INLINE rep' #-}

rep1 :: Monad m => Int -> (Int -> m ()) -> m ()
rep1 n = flip VFSM.mapM_ (stream 1 (n + 1))
{-# INLINE rep1 #-}

repM :: Monad m => Int -> Int -> (Int -> m ()) -> m ()
repM m n = flip VFSM.mapM_ (stream m (n + 1))
{-# INLINE repM #-}