There is a large square pond with a circumference of 80 meters, and a willow tree is planted every 5 meters from the apex of the square. How many willows can be planted in total?
有个周长80米的正方形大池塘，从正方形的顶点起每5米栽一棵柳树，一共可栽多少棵？
<gadget id="calculator">80 / 5</gadget>
<output>16</output>

<result>16</result>