There were originally 520 students in the fourth grade of Hope Primary School. This semester, 38 students were transferred, and 49 students were transferred. How many people do you hope there are in the fourth grade of elementary school now?
希望小学四年级原有学生520人，这学期转走38人，又转来49人．现在希望小学四年级有多少人？
<gadget id="calculator">520 - 38</gadget>
<output>482</output>

<gadget id="calculator">482 + 49</gadget>
<output>531</output>

<result>531</result>