We are glad to invite you to take part in the 9th Edition of the COJ Progressive Contest. The problems for all levels are from students of Universidad de las Ciencias Informáticas (UCI) in Cuba. The contest duration is 10 days (from 2015-07-07 10:00:00 to 2015-07-17 10:00:00). The tasks are in English. The allowed programming languages are C, C++, C++11, C#, Java, Perl, PHP, Bash, Ruby, Pascal and Python. The contest will be held on the rules for progressive competitions in the COJ. If you have any question, please feel free to ask on [email protected] To participate you need to have an account in the Caribbean Online Judge http://coj.uci.cu/user/createnewaccount.xhtml . You don't need to register in the contest: the registration in the contest is effective with the first submission.