In the third grade of Red Scarf Primary School, there are 257 boys and 235 girls, 387 have had physical examinations, and how many have not had physical examinations?
红领巾小学三年级有男生257人，女生235人，已经体检身体的有387人，没有体检的有多少人？
<gadget id="calculator">235 - 387</gadget>
<output>-152</output>

<gadget id="calculator">257 + (-152)</gadget>
<output>105</output>

<result>105</result>