box% python
Python 3.8.6 (default, Sep 30 2020, 04:00:38) 
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 23451 + ~4565
18885
>>> 23451 - 4565 - 1
18885
>>> 348723 + ~294341
54381
>>> 348723 - 294341 - 1
54381