A pile of logs has 5 logs at the top and 14 logs at the bottom. There is one log difference between every two adjacent floors, how many logs are there in total in this pile.
一堆圆木，最顶层有5根，最底层有14根．每相邻两层相差1根圆木，这堆圆木一共有多少根．
<gadget id="calculator">14 + 5</gadget>
<output>19</output>

<gadget id="calculator">14 - 5</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">19 * 5</gadget>
<output>95</output>

<result>95</result>