A book has 64 pages. When accumulating the page numbers of each page in this book, one page number was added one less time. The resulting sum is 2030. What is the page number that was added less?
一本书有64页，在把这本书的各页的页码累积起来时，有一个页码被少加了一次，结果得到的和数为2030，求这个被少加了的页码是多少？
<gadget id="calculator">1 + 64</gadget>
<output>65</output>

<gadget id="calculator">64 / 2</gadget>
<output>32</output>

<gadget id="calculator">65 * 32</gadget>
<output>2_080</output>

<gadget id="calculator">2_080 - 2_030</gadget>
<output>50</output>

<result>50</result>