Round a number?

[aegis72]

I am making a node setup that needs to make an image divisible by 16 on each side before passing to P2LDGAN to create line art.

I tried to use the Math Expression node to try to do "round(a / 16) * 16" for the X and Y, after first resizing the image to 1024 on the X side. In this way, I hope to deliver to P2LDGAN a number divisible by 16 (it requires this), and to use this integer for the latent image size as well. But I can't use Round yet in that node.

I realize that the rounding happens when it is turned from a float to an Int, but that doesn't work for this situation. f/e, the image shown here, of a Chun li I drew and want to restyle, reduces (without an initial round) to 680x1024, which means the 680 divides by 16 to 42.5. If I had a rounding node, I could cobble something together with the bits of other folks that have made simple math nodes, including WAS...but so far I have not been able to find a way to round a result :(.

My nodes look like so:

Anyone have an idea how I might do this?