There are 28 people in the tour group staying in the hotel, living in 3-person rooms and 2-person rooms (each room cannot have vacant beds), how many different arrangements are there?
旅游团有28人到旅馆住宿，住3人间和2人间(每个房间不能有空床位)，有多少种不同的安排？
<result>5</result>