A worm crawls 3 times along a square with a side length of 5 cm, how many cm has it crawled in total?
一只小虫沿着一个边长是5厘米的正方形爬了3圈，一共爬了多少厘米．
<gadget id="calculator">5 * 4 * 3</gadget>
<output>60</output>

<result>60</result>