There are 10 layers of logs stacked in a warehouse, with 3 logs on the first layer and 1 log on each lower layer. How many logs are there in this pile?
某仓库堆放一批圆木，一共10层，第一层3根，每往下一层多1根，问这堆圆木一共有多少根？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<gadget id="calculator">12 + 3</gadget>
<output>15</output>

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

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<result>75</result>