Whoops - sorry replied directly to Richard instead of to the list. Submission process is simply to post to the list. It's probably a good idea ( and acceptable ) to just post an SHA1(MD5 for this purpose is compromised) hash of your code before the deadline, and submit your actual code shortly after the deadline. The result must be greater than the input. For 2 as an input, I'd expect 3 as output. Rory