module Main where

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

main :: IO ()
main = do
  [a, b] <- map (fst . fromJust . BS.readInt) . BS.words <$> BS.getLine
  print $ solve a b

solve :: Int -> Int -> Int
solve a b | a == b    = r - 1
          | otherwise = r
  where r = (a + b) - abs (a - b)