Section 1.2: Where does the "880 cycles per multiplication" number comes from? #232

Note: My question concern the english version of this great book.

After the initial python code, the chapter calculate the following:

"880 cycles per multiplication in the innermost loop"
Source: Section 1.2

Considering the numbers provided, I don't understand where the 880 cycles come from.
To my understanding the number should be ~821 cycles

Thanks for this amazing ressources !