Period with block and spring?

The 3.60 kg cube in Fig. 15-45 has edge lengths d = 6.30 cm and is mounted on an axle through its center. A spring (k = 1400 N/m) connects the cube's upper corner to a rigid wall. Initially the spring is at its rest length. If the cube is rotated 4.00� and released, what is the period of the resulting SHM?