Oscillating disks on a step

Two uniform circular disks of masses MM and 4M4M and radii RR and 2R,2R, respectively, are connected by a massless spring of force constant kk and placed at different heights so that the spring is parallel to the horizontal, as shown above.

Initially, the spring is compressed, and then the system is released from rest. Assuming friction is large enough to prevent slipping, find the angular frequency of oscillation of the system.

If you answer comes in the form of akbM,\sqrt{ \dfrac{ak}{bM}}, where aa and bb are coprime positive integers, then enter a+ba+b as the final answer.

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