On the edge of a rectangular playground with a length of 40 meters and a width of 30 meters, a colored pole is erected every 5 meters, and each vertex must be erected. How many colored poles should be erected in total.
在一个长为40米，宽为30米的长方形操场边上，每5米立一根彩杆，每个顶点都要立，一共要立多少根彩杆．
<gadget id="calculator">40 + 30</gadget>
<output>70</output>

<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<gadget id="calculator">140 / 5</gadget>
<output>28</output>

<result>28</result>