Metasequoia trees are planted around the rectangular playground. The playground is 80 meters long and 60 meters wide. One tree is planted every 5 meters, and all four corners are planted. How many trees are planted in total?
长方形操场四周栽水杉树，操场长80米，宽60米，每隔5米栽1棵树，四个角上都要栽，一共栽多少棵树？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">140 * (2/5)</gadget>
<output>56</output>

<result>56</result>