The school students line up in a square formation to perform. During the performance, they form a multi-layer hollow square formation with 64 people on the outermost layer and 16 people on the innermost layer. How many students are there in this square formation?
学校学生排成方阵进行表演，表演时组成一个最外层有64人，最内层有16人的多层中空方阵，这个方阵共有学生多少人？
<gadget id="calculator">16 + 16 + 8 + 16 + 8 + 8 + 16 + 8 + 8 + 8 + 16 + 8 + 8 + 8 + 8 + 16 + 8 + 8 + 8 + 8 + 8 + 16 + 8 + 8 + 8 + 8 + 8 + 8</gadget>
<output>280</output>

<result>280</result>