import Control.Applicative ((<$>))

main :: IO ()
main = solve <$> map read <$> words <$> getLine >>= putStrLn

solve :: [Int] -> String
solve (n:m:_) | (n == 1 && m == 2) || (n == 2 && m == 1) = "YES"
              | (n == 1) || (m == 1) = "NO"
              | odd (n * m) = "NO"
              | otherwise = "YES"