Nesting IF Formula

I have been reading though the discussions and have attempted to nest the IF functions but I am having difficulties with it maybe someone will be able to help me. We are using check boxes to track numbers when checked. I created the function and got it to work.

=IF([PRHT Wrap  Claimed]10, 10, 0)

The issue I am having is, we N/A the cells when they are not being used so they are not accidently checked. This of course creates a #INVALID DATA TYPE ERROR. I have made multiple different attempts to make it so a N/A is equal to zero but I am not having any luck. I am thinking I need a nested IF formula but I am not for sure. Formulas are not my strong suite sadly. Any help on this would be great




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