A pile of cylindrical wood is placed in a trapezoidal shape. There are 4 logs on the top layer and 14 logs on the bottom layer. There are 6 layers. How many logs are there in this pile?
一堆圆柱形木料呈梯形摆放，最上层摆4根，最下层摆14根，摆了6层，这堆木料共有多少根？
<gadget id="calculator">4 + 14</gadget>
<output>18</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>