A larva grows into an adult. Every day, it grows from 1 cm to 2 cm (increasing 1 cm every day). After 4 days, how many times its original length?
一种幼虫长成成虫，每过一天，由原来的1厘米长成2厘米(每天增加1厘米)，经过4天，它的长度是原来的多少倍？
<gadget id="calculator">1 * 1</gadget>
<output>1</output>

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

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

<result>10</result>