How do I return a negative value in Ida Pro?

I'm using Nox version 7.0.1.0 APK File ~ https://ift.tt/2RiflAo I have found the offset for getting an item cost but I would like to return a negative value instead of 0 or a low positive number, the only problem is that it HAS to be an unsigned integer instead of a regular integer... Which means I can only set it to a positive value but I need it to be negative for the hack I want for the game Is there a specific way to bypass the unsigned integer to make it return a negative number? Is there a way? I would like any help if possible ~ I will give you guys any info you need below in the comments section ~ THANK YOU

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