ohhh. cool

It'd work anyways.

Clever solution!

Late reply, but you subtract one number from the "num_pill" since there exist only one space/distance in between two pillars. Same as all real life objects, there exist only one space in between two objects.

number of pillars (≥ 1) is given to us. We have no need to check it in our code

i like this solution cleaner and clear

what is num_pill - 1 ?
sorry I can't understand.

This would need input validation in produciton as entering a negative integer produces incorrect results. For example, entering -1 pillars returns -4000

Thanks!

That's because you didn't use elif. But it shouldn't matter if you return the price instead of printing it, return ends the function.