open Printf
open Scanf

let id x = x

let a, b = scanf "%d %d" (fun a b -> a, b)

let () =
  let n1 = a * b * 1 in
  let n2 = a * b * 2 in
  let n3 = a * b * 3 in
  if n1 mod 2 = 1 || n2 mod 2 = 1 || n3 mod 2 = 1 then
    print_endline "Yes"
  else
    print_endline "No"

