There are 52 people in class 3 and 3 participating in the gymnastics performance. If they stand in a square team, at least how many people must be removed.
三3班有52人参加体操表演，如果站成方队，至少要去掉多少人人．
<gadget id="calculator">52 - 49</gadget>
<output>3</output>

<result>3</result>