How to change file export numeration?

I'm exporting each frame of my animation as an obj with the animation export option.

Blender automatically outputs all the numerated files however it adds 0s before the numbers.

Example: run_000001.obj run_000002.obj ... run_000522.obj

I cannot find any setting to remove the 0s, I'd like for it to export them: run_1.obj run_2.obj ... run_522.obj

use # to define how many decimals you want.
from frame 1 to frame 9 use #.obj
frame 10 to 99 use ##.obj
frame 100 to 999 use ###.obj