Easiest way to use all of the brownies: Give everyone a whole, a half and a fourth.
Or, give everyone one and a half and no one gets the last one.
Or, give everyone one and leave the other 3.
Or cut a quarter off of each of the three extras and give three people one and three quarters and the last person 1 and the remaining three pieces which are each a quarter.
There are many more ways but that about covers it.