def main():
    A, B = map(int, input().split())

    ans = 'Yes'
    while A > 0 and B > 0:
        if not A % 2:
            A %= 2
            B -= 1
        elif not B % 2:
            A -= 1
            B %= 2
        else:
            ans = 'No'
            break
    print(ans)

main()