I am stuck on Non-Maryland losses and adjustments

I am filing jointly and currently working on my Maryland state taxes. I worked in 3 states - MN, MD, and PA. 

The picture below shows two queries - I answered the first by adding box 1 for MN and PA W2s. Is this correct? 

Box 2 asking about adjustments and losses is where I am stuck. How do I calculate this? 

Please help. How do I calculate losses and adjustments. Is there anywhere on my W2 that I can find this information. Do I look at my 1099-R?

 

 
 

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