let me draw, because these are going to get jumbled up soon so this returns this stuff in magenta and this stuff I've underlined in green will return n is now 3; 3 is not less than 2 so you go here and it will return fibonacci of 3-1 which is fibbonacci (2) and plus fibonacci of 3-2, which is fibonacci (1) and then we're going to go over here and we're going to have to calculate each of these things and these are just more calls to fibonacci and fibonacci(3), so you can see how this is getting pretty involved right now