A square phalanx has 84 people in the outer layer. How many people are there in this phalanx?
一个正方形方阵，外层共84人，这个方阵共有多少人？
<gadget id="calculator">84 + 4</gadget>
<output>88</output>

<gadget id="calculator">88 / 4</gadget>
<output>22</output>

<gadget id="calculator">22 * 22</gadget>
<output>484</output>

<result>484</result>