There are 378 boys and 346 girls in the first grade of Chenguang Primary School. There are 300 people who have had a physical examination, how many people have not had a physical examination?
晨光小学一年级有男生378人，女生346人．已经检查身体的有300人，没检查身体的有多少人？
<gadget id="calculator">378 + 346</gadget>
<output>724</output>

<gadget id="calculator">724 - 300</gadget>
<output>424</output>

<result>424</result>