Exclude sub categories

Hello, how can I exclude subcategories from showing. I want to have only my main categories show up and I have this code:

<?php list_cats(0, ”, ‘name’, ‘asc’, ”, 1, 0, 0, 1, 1, 1, 0,”,”,”,”,”) ?>

I can’t find the correct point in this code to change so only main categories appear.
Any help would be greatly appreciated.

Thanks