The third grade students do exercises, if every group of 16 people, every group of 18 people, how many people do the exercises at least in the third grade?
三年级同学做操，如果每16人一组，每18人一组，三年级最小有多少人做操？
<gadget id="calculator">2 * 2 * 2 * 2 * 3 * 3</gadget>
<output>144</output>

<result>144</result>