Math. How-to in a node?

What node to calculate a value?

The API I’m interfacing with tells me the page length in lines, the page number, and how many lines are in the data. If I pull a page past the end, it just returns the last page with page number I requested.

Example: If there are 3 pages, and I request page 10, I get the data from page 3, with a page 10 field.

My solution appears to be:

if [ page# * page_lines >= total_lines ] loop, else process

I just can’t see what node I need for this. I’ve looked at the ‘If’ node, but how to multiply the two values is escaping me.