Wipe colored flags around a square grass field with a side length of 40 meters, insert one side every 5 meters (one side is inserted at each vertex of the square), how many colored flags should be inserted in total.
在一个边长是40米的正方形草地的四周擦彩旗，每隔5米插1面(正方形的每个顶点插1面)，一共要插多少面彩旗．
<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">36 - 4</gadget>
<output>32</output>

<result>32</result>