How to change shifts at the front desk of the express hotel?

If four people are lucky, there are four shifts and three shifts (three people go to work and one has a rest). Three people who go to work each have eight hours and the other can have a rest. If there are three people, there can only be three shifts and two shifts (two go to work and one rest). Two people who go to work each have 12 hours, and the other can rest. There are generally no hotels for three people.