There are 66 students in the drum and horn team, and they must stand in a square team during the performance, and at least how many people must be eliminated.
鼓号队有66名同学，演凑时要站成方队，至少要去掉多少人．
<gadget id="calculator">66 - 64</gadget>
<output>2</output>

<result>2</result>