Prezi is available on multiple platforms, so we have to convert some of the uploaded media files to other formats before we can display them on all devices. This conversion happens on virtual machines. At peak times, we need to launch more of these but over the weekend we can stop most of them. Help us find the perfect algorithm that launches exactly the number we need! This contest is for university students, who want to test their knowledge of control and queueing theories on actual, real-life problems.