import qualified Control.Arrow         as Arrow
import qualified Control.Monad         as Monad
import qualified Data.Char             as Char
import qualified Data.List             as List
import qualified Data.ByteString.Char8 as BSC8
import qualified Data.Vector.Unboxed   as VU

-- | 一行入力 Intリスト
getInt :: IO [Int]
getInt = List.unfoldr f <$> BSC8.getLine
  where
    -- f :: BSC8.ByteString -> Maybe (Int, BSC8.ByteString)
    f s = do
      (n, s') <- BSC8.readInt s
      return (n, BSC8.dropWhile Char.isSpace s')
main :: IO ()
main = sum <$> getInt >>= print