There are 4 classes in the third grade of a certain school, and each class has 2 interest groups. If each interest group has 16 students, how many students in the third grade participated in the interest group?
某校三年级有4个班，每班有2个兴趣小组，如果每个兴趣小组有16人，三年级一共有多少人参加了兴趣小组？
<gadget id="calculator">16 * 2 * 4</gadget>
<output>128</output>

<result>128</result>