I wrote an hostages counter app with no knowledge of how to do this, using only Google Gemini for assistance.
You can download the app from this link:
https://www.dropbox.com/scl/fi/ax1uxz2r5yqnhq7qcqj6z/counter-1.0.0-Setup.exe?rlkey=09r1x7mexx4i99hh23jdxuw5g&st=gtx4cj4p&dl=0