A group of students form a square, with 16 people standing on each side (there are people at all four vertices), how many students are there in total?
一队学生围成一个正方形，每边站了16人(四个顶点都有人)，共有多少名学生．
<gadget id="calculator">16 * 4</gadget>
<output>64</output>

<gadget id="calculator">64 - 4</gadget>
<output>60</output>

<result>60</result>