New coding contest

We haven't had one in a while so let's have a new coding contest. I'm open to suggestions for the challenge, but if we don't have any good suggestions we will default to something stupid like "implement cowsay in erlang shitty language X".

Given a function fibs(int n):int, that returns the n'th fibonacci number, write a function sumFibs(int n):int, that returns the sum of the first n fibonacci numbers with only one call to fibs and no loops or recursion.