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Yeah... your algebra teacher (no, even your math teacher :D) would be shocked.
If this bothers you, let me explain that I stated the number that can be achieved even in the worst-case scenario for you. That is, there won't be a worse result than 23115 in this playthrough. Whether it will be better or not depends on you. There are more than enough opportunities to score more than 23115 skeletons in this scenario. ;)