Why is the output 10?

Question

https://code.sololearn.com/wlPWn37iQBQT/?ref=app

In-regards to the aforementioned code, how is the output 10? I’ve been looking this over for quite a bit and I’m still stuck. An enlightenment on this issue would be appreciated. Thanks in advance.

Answer 1

Oh, I see. I didn’t realize it was adding them. Much appreciated.