func main()
	var n: int :: cui@inputInt()
	var m: int :: cui@inputInt()
	var ans: bool :: true
	if((n = 1 | m = 1) & n * m <> 2)
		do ans :: false
	end if
	if(n % 2 = 1 & m % 2 = 1)
		do ans :: false
	end if
	do cui@print(ans ?("YES\n", "NO\n"))
end func