The Guangming Theater can accommodate 500 people. After all the third-grade students are seated, there are 3 rows of empty seats, and each row has 38 seats. How many people are there in the third grade?
光明影院能容纳500人，三年级学生全部入座后还剩3排空座位，每排有38个座位．三年级一共有多少人？
<gadget id="calculator">3 * 38</gadget>
<output>114</output>

<gadget id="calculator">500 - 114</gadget>
<output>386</output>

<result>386</result>