The page numbers of a book are consecutive natural numbers 1, 2, 3, ..., when these page numbers are added up, a certain page number is added twice, and the incorrect result is 1999, which is added twice What is the page number.
一本书的页码是连续的自然数1，2，3，…，当将这些页码加起来的时候，某个页码被加了两次，得到不正确的结果是1999，这个被加了两次的页码是多少．
<gadget id="calculator">62 + 1</gadget>
<output>63</output>

<gadget id="calculator">63 / 2</gadget>
<output>63/2 = around 31.5</output>

<gadget id="calculator">62 * (63/2)</gadget>
<output>1_953</output>

<gadget id="calculator">1_999 - 1_953</gadget>
<output>46</output>

<result>46</result>