A pile of wood, the top layer is 10, and each lower layer is 1 more than the previous layer. There are 5 layers in total. How many logs are there in this pile?
一堆木料，最上层是10根，下面每层都比上一层多1根，共有5层，这堆木料共有多少根．
<gadget id="calculator">10 + 14</gadget>
<output>24</output>

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

<gadget id="calculator">24 * (5/2)</gadget>
<output>60</output>

<result>60</result>