How to gain weight????

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I am currently in the Police Academy. Started in the beginning of August 2017, and weighed around 170LBS. I am a 29y/o Male, 5'11" and currently have dropped down to 129LBS. Yes that is not a typo! Little info on my daily routine: I attend the Academy Monday-Friday from 0830 to 1530. I have to run 1.5 miles, do 35 push-ups (in under 1min) and 40sit-ups(in under 1min) every week usually on Friday's. I know that is not much at all but I also am prescribed adderall, which definitely decreases my appetite. I just started getting serious about packing the pounds back on...just not exactly sure where to start. I have always been on the thin side my whole life, but I need to put on wait and bulk up. If you have any advice on what foods, diet, or anything (that is legal) to help me gain weight I am all ears. Thanks!

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