There are 5 round steel pipes in the top layer and 9 pipes in the bottom layer. There are 5 layers in total. How many steel pipes are there in this pile?
一堆圆形钢管，最上层有5根，最下层有9根，一共有5层这堆钢管一共有多少根．
<gadget id="calculator">5 + 9</gadget>
<output>14</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">14 * (5/2)</gadget>
<output>35</output>

<result>35</result>