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**[SOLVED] a tricky Moment of Inertia question, help needed...**

The question is in the JPG attachment.

This is what i tried:

Obviously the side which is right on the axis has no moment of inertia so we're left with the 2 horizontal ones and the other vertical. for the two horizontal sides we've got an equation: (M*L^2)/3 and we consider it twice.

the last side is probably where i went wrong - i thought it's simply M*L^2 because it can be regarded as a point mass at distance L but that didn't work. then i tried using the parallel axis theorem but that didn't help too.

Any thoughts? i'm sure its really easy for most of you guys...

Thanx.