module Main where

type Input  = (Int, Int)
type Output = Bool

parse :: String -> Input
parse s =
    let
        [a, b] =
            map read
            . words
            . head
            $ lines s
    in
        (a, b)

solve :: Input -> Output
solve (a, b) =
    let
        cond1 = a == b

        cond2 = max a b == 4 && min a b == 2
    in
        cond1 || cond2

render :: Output -> String
render True  = "Yes"
render False = "No"

main :: IO ()
main =
    interact
        ( render
        . solve
        . parse
        )