The tasks for week 15 are as follows:
Week problem: 10856 Recover Factorial
Weekend problem: 11428 Cubes
Suggested bonus: 11721 Instant View of Big Bang
You must submit your solutions on http://uva.onlinejudge.org/
You can browse to these problems from the online judge website by clicking on Browse Problems, Contest Volumes, and then selecting the contest volume as indicated above.