The page numbers of a book range from 1 to 82, and there are 82 pages in total. When the page numbers of the pages of this book are added up, one page number is added by mistake, and the resulting sum is 3440. So what is the page number that has been added once?
一本书的页码从1至82，共有82页，在把这本书的各页的页码累加起来时，有一个页码被错误的多加了一次，结果得到的和为3440．则这个被多加了一次的页码是多少？
<gadget id="calculator">1 + 82</gadget>
<output>83</output>

<gadget id="calculator">82 / 2</gadget>
<output>41</output>

<gadget id="calculator">83 * 41</gadget>
<output>3_403</output>

<gadget id="calculator">3_440 - 3_403</gadget>
<output>37</output>

<result>37</result>