Two point-like objects of masses 20 gm and 30 gm are fixed at the two ends of a rigid massless rod of length 10 cm. This system is suspended vertically from a rigid ceiling using a thin wire attached to its center of mass, as shown in the figure. The resulting torsional pendulum undergoes small oscillations. The torsional constant of the wire is 1.2×10⁻⁸ N m rad⁻¹. The angular frequency of the oscillations in n×10⁻³ rad s⁻¹. The value of n is _____.