Sister Xiaohe is learning English. She learned one English word on the first day, and two words on the second day. After that, she learns one more word every day than the previous day. Please do the math. After 60 days, she has learned How many words?
小荷姐姐学英语，第一天她学了一个英语单词，第二天学了2个单词，以后每天都比前一天多学1个单词，请你算一算，到了60天，她共学了几个单词？
<gadget id="calculator">1 + 60</gadget>
<output>61</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">61 * 30</gadget>
<output>1_830</output>

<result>1_830</result>