A total of 58 students from Class 3 and 3 donated money and materials to the children in the disaster area. Among them, 38 people donated money and 43 people donated materials. How many people donated both money and materials.
三3班共有学生58人向灾区小朋友捐钱、捐物，其中捐钱的有38人，捐物的43人，既捐钱又捐物的有多少人．
<gadget id="calculator">91 - 58</gadget>
<output>33</output>

<result>33</result>