A solid gymnastics phalanx with 72 people on the outermost layer. How many people are there in this gymnastics phalanx?
一个实心体操方阵，最外层有72人．这个体操方阵有多少人？
<gadget id="calculator">72 + 4</gadget>
<output>76</output>

<gadget id="calculator">76 / 4</gadget>
<output>19</output>

<gadget id="calculator">19 * 19</gadget>
<output>361</output>

<result>361</result>