I used `/` over `//` because `d = gcd(a, b, c)` so `a/d`, `b/d` and `c/d` all are integers.
To provide python3 support there is a recommendation to use `//` [here](https://pypi.python.org/pypi/IPy/).
I don't know that's what you were trying to recall. Anyway, there is no harm in replacing `/` with '//'.
So I'll make that change.