Please could someone help me explain what's happening in this code... A thorough explanation please..

Question

https://code.sololearn.com/WWub4idNPqi8/?ref=app

Answer 1

thanks bro

Answer 2

If you output the "sum" variable in the final line, you will get 18, then if you set p = 2, the result of the sum is 17 (that is correct), it doesn't need to analyze number 0 and 1 :)