fun main(args:Array<String>) {
    val (n,m) = readLine()!!.split(" ").map { it.toInt() }
    println(if(isValid(n,m)) "YES" else "NO")
}

fun isValid(n:Int, m:Int):Boolean {
    if(n == 1 || m == 1) {
        return n*m == 2
    }
    return n % 2 == 0 || m % 2 ==0
}