THEM: i would like the balls.  YOU: i need at least one ball and the hat and the book  THEM: i can't do that. i can give you 1 ball and the book.  YOU: that will not work. i need the hat and two balls  THEM: i need atleast 2 balls.  YOU: you can have two balls if i can have the rest  THEM: that will have to work.  YOU: okay great! thank you!