The students participating in the gymnastics performance on the "June 1st" festival lined up in a square formation with two layers on each side, with 10 people on each side on the outermost layer. How many students participated in the gymnastics performance?
"六一"节参加体操表演的同学排成一个每边两层的方阵，最外面一层每边10人，参加体操表演的共有多少同学？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 - 4</gadget>
<output>36</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">32 - 4</gadget>
<output>28</output>

<gadget id="calculator">36 + 28</gadget>
<output>64</output>

<result>64</result>