I want to read in a number with any number of digits with bf. I know how to read in the correct number of digits if I set it manually, like this:

,>,>, 2 Read in 3 digits
<< 0
--------
--------
--------
--------
--------
-------- 45 decrements
> 1
--------
--------
--------
--------
--------
--------
> 2
--------
--------
--------
--------
--------
--------

[>+<-]< 1 Copy digit 3 to cell 3

[>>++++++++++<<-]< Copy 10 * digit 2 to cell 3

Copy 100 * digit 1 to cell 3
[>>>>++++++++++ 4
    [<++++++++++>-] 4
<<<<-]>>> 3

>++++++++++..< Add 2 line breaks

., Print and Pause

But I'd rather be able to set a number in cell 0 and then automatically multiply the right number of times for each digit. What would I be best off doing?

math brainfuck
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