[3.5, Base Class] The Magic Marksman (PEACH)

[TravelLog]

Ninth Level

Mana Guard (A): You manipulate your mana to augment your overall defenses against physical or mental attacks. By spending five mana points, you gain an insight bonus to all saves equal to one fourth you marksman levels divided by four rounded down.

This confuses me. At level 20, this is a bonus of (20/4)/4=1

I assume you added the divide by 4 twice?