Limit the MASH random node


for example, I want to randomize the leaves by setting their rotation in Random node to 15. However, it randomizes the leaves within -15…+15 degrees. what I want is to rotate them randomly only within 0…15 degrees (simply saying, I don’t want the leaves to tilt down)

this is perfectly solved in corona scatter (which is unfortunately absent for maya)

or maybe there is a way to write a small expression in that box like in Houdini?