list transformation struggle

For some reason I can't quite seem to figure this one out. I have an 8 integer list, only 0's or 1's. I would like to transform that list based on the following rule:

• For every 0, the new list should have x 0's and y 1's (e.g. if x = 2 and y = 3, then list 00110011 becomes 00001111110000111111)

I can of course iter through the list, but transforming each element and adding to a new list is causing me headaches, in particular when trying to add multiple 0's. Any help greatly appreciated!