Render every 3rd. Frame?

Is there a way to make blender render every third frame? I have multiple computers rendering to a Dropbox folder, so when the frames update in the folder, it sometimes is not fast enough to see the marker file and the other computers start rendering duplicate frames. So I would like to remedy this by telling each computer to render every third frame so that they will never have a chance to render the same frame. Is there a way to do this?

M. Lightning

In the Render / Dimensions panel you have the Frame Step option

Excellent. Thank you so very much.

M. Lightning