A group of students is arranged in a hollow square, with 52 people on the outermost layer and 28 people on the innermost layer. How many people stand in this square?
一队学生排成中空方阵，最外层的人数为52人，最内层的人数为28人，这一方阵共站多少人．
<gadget id="calculator">52 - 8</gadget>
<output>44</output>

<gadget id="calculator">52 - 8 - 8</gadget>
<output>36</output>

<gadget id="calculator">52 - 8 - 8 - 8</gadget>
<output>28</output>

<gadget id="calculator">52 + 44 + 36 + 28</gadget>
<output>160</output>

<result>160</result>