The only thing that makes it a "challenge" is knowing the formula. A brand new coder can solve this barely knowing a language if they heard the formula once.

I agree.

The hardest 8kyu kata I've encountered yet XD

Way too easy for 7kyu imo

Thanks a lot

You are trying to write to a variable outside the scope of your function with p0 += something.
(It's bad practice to use functions to edit variables outside of your function to begin with most of the time)

By declaring pop you have a variable you can write to and do what you want with inside your function.

By now, you used 2 of 3 ways to convert a float number to an integer, the right one is the one you haven't tried.

thanx, I have already understand that I have missed that :)
during debug, I missed that I should compare with 1214 not 1200 🙂

In the description the value is 1200, yes. In the test your code fails, it is 1214.