A pile of steel pipes, the difference between two adjacent layers is 1. It is known that there are 8 steel pipes in the uppermost layer and 15 steel pipes in the lowest layer. There are 8 layers in total. How many steel pipes are there in this pile?
一堆钢管，相邻两层之间相差1根，已知最上层有8根，最下层有15根，一共有8层，这堆钢管共有多少根．
<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">8 + 15</gadget>
<output>23</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">23 * 4</gadget>
<output>92</output>

<result>92</result>