There are 684 students in the first grade of Chenguang Primary School. There are 390 people who have had a physical examination, how many people have not had a physical examination?
晨光小学一年级有学生684人．已经检查身体的有390人，没检查身体的有多少人？
<gadget id="calculator">684 - 390</gadget>
<output>294</output>

<result>294</result>