Teacher Li selects students to participate in theatrical performances. During the performance, there are two formation changes. One is a group of 3 people, and the other is a group of 5 people. There should be no surplus. Teacher Li has already selected 22 people, at least how many more people should be selected just right?
李老师挑选同学参加文艺演出，演出时有两次队形变换，一次是3人一组，一次是5人一组，不能有剩余．李老师已经挑选了22人，至少还要再挑选几人才刚好合适？
<gadget id="calculator">30 - 22</gadget>
<output>8</output>

<result>8</result>