Grasshopper definition for editing dimensions of cube with set volume.

Hi, I am fairly new to Grasshopper and am not very proficient writing my own definitions. I was wondering if there is a definition I could use where I set a certain volume for a cube, but I can edit the length, width, and height variables of the cube without changing the total volume? If anyone has any advice on how to go about writing a definition that would accomplish this task, it would be much appreciated.

Cheers!