33.333333333333336+33.666666666666664 = 67
use 1 "/" symbol, 2 " //" is for rounding, sorry.
in Python the // operator stands for floor division, that means it divides the first number by the second number and rounds the result
down to the nearest integer.
It works for the private key, but what we have is the public key; in this case, Python doesn't round the result.