Fix cell in google sheets for autocomplete to ignore?

I have a column with values (E) and a cell with another value (F12). I want to multiply both using autocomplete but I don't know how, since autocomplete is going to increase the value of F12 as well.
The only option I know is to copy F12 all over column F and let autocomplete do it's thing, but it's really nasty.
Anyone knows a way to fix F12 or a workaround that won't take me an hour to implement?
Thanks!
PS: using the value of F12 inside the formula is not a solution.
Answer
I know it sucks, it really does. A sunrise at 03:44 seems out of sync
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