In a pile of logs, there are 14 logs on the top layer and 20 logs on the bottom layer, and there is a difference between each two adjacent layers. How many logs are there in this pile?
一堆圆木，最上面一层有14根，最底一层有20根，每相邻的两层相差一根，这堆圆木有多少根？
<gadget id="calculator">14 + 20</gadget>
<output>34</output>

<gadget id="calculator">20 - 14</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">34 * (7/2)</gadget>
<output>119</output>

<result>119</result>