A flat surface of a thin uniform disk A of radius R is glued to a horizontal table. Another thin uniform disk B of mass M and the same radius rolls without slipping on the circumference of A. A flat surface of B also lies on the table. The center of mass of B has fixed angular speed ω about the vertical axis through the center of A. The angular momentum of B is nMωR² with respect to the center of A. What is n?