Subtract (1/2) from 1999, then subtract the remaining (1/3), and then subtract the remaining (1/4). After subtracting 1998 times according to this rule, what is the remaining number?
1999减去它的(1/2)，再减去余下的(1/3)，再减去又余下的(1/4)，按这个规律减1998次后，余下的数是多少．
<gadget id="calculator">1 / 1_999</gadget>
<output>1/1_999 = around 0.0005</output>

<gadget id="calculator">1_999 * (1/1_999)</gadget>
<output>1</output>

<result>1</result>