Small blocks, each with mass m, are clamped at the ends and at the center of a

Question:

Small blocks, each with mass m, are clamped at the ends and at the center of a rod of length L and negligible mass. Compute the moment of inertia of the system about an axis perpendicular to the rod and passing through
(a) The center of the rod and
(b) A point one-fourth of the length from one end.