There is a tourist group of 80 people, including 50 men and 30 women. The hotel they live in has three types of rooms: 11 people, 7 people and 5 people. Men and women live in different rooms separately (the rooms do not allow available beds), at least how many rooms do they have to live in.
有1个80人的旅游团，其中男人50人，女人30人，他们住的旅馆有11人间、7人间和5人间的三种房间，男女分开住在不同的房间(所住的房间不允许有空床)，他们至少要住多少间房间．
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<result>10</result>