A guy finds a Genie bottle

A guy finds a Genie bottle

sure enough a Genie pops out and says "you get three wishes, but whatever you wish for, your ex-wife will get double"
Guy says "fine, whatever for my first wish I want a beautiful mansion in Hawaii"
Genie says "you got it, but now your ex-wife has two"
Guy says "yeah, whatever, for my next wish I want 10 billion dollars tax free"
Genie says "you got it, but now your ex-wife has 20 billion tax free dollars, what's your third and final wish?"
The guy thinks for a bit then says "I know, I want you to beat me half to death!"