In a pile of steel pipes, there are 14 steel pipes in the bottom layer and 2 steel pipes in the top layer, and the difference between two adjacent layers is 2 steel pipes. How many steel pipes are there in this pile?
一堆钢管，最下层14根，最上层2根，每相邻的两层都相差2根，这堆钢管共多少根．
<gadget id="calculator">2 + 14</gadget>
<output>16</output>

<gadget id="calculator">14 - 2</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">16 * (7/2)</gadget>
<output>56</output>

<result>56</result>