class Proc {
    public func doProc() {
        let inpt = readLine()!.split(separator: " ").map{ Int($0)!}
        let r = inpt[0]
        let c = inpt[1]

        var ans = "NO"
        if(r == 1 || c == 1) {
            print(ans)
            return
        }

        if(r == 2 || c == 2) {
            ans = "YES"
        } else if r % 2 == 0 || c % 2 == 0 {
            ans = "YES"
        }
        print(ans)
    }
}

Proc().doProc()