How to reverse the image sampler

Hi, here is the image sampler which I just did. How can I make black area of the image to be bigger circles and white area to be smaller circles (reverse the now effects)?

Assuming the output of the sampler is from 0 to 1, then before you do your division, use the subtraction component to subtract the output from 1.

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Thank you so much Ethan, problem solved by subtraction component.