Add consecutive natural numbers 1, 2, 3, 4, 5, 6, 7, ... one by one to get the result 2012. When checking the calculation, it was found that a number was omitted, so what is the number that was omitted.
将连续自然数1、2、3、4、5、6、7、…逐个相加，得结果2012．验算时发现，漏加了一个数，那么这个漏加的数是多少．
<gadget id="calculator">2_016 - 2_012</gadget>
<output>4</output>

<result>4</result>