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

main :: IO ()
main = putStrLn . canZap . map read . words =<< getLine