A total of 64 students were selected from the fourth grade to participate in the opening ceremony of the sports meeting. They lined up in a square and entered the stadium. How many people are there in the outermost layer of the square?
四年级共选出64名同学参加运动会的开幕式他们排成一个方阵入场这个方阵的最外层一共多少人？
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

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

<result>28</result>