The page numbers of a dictionary share 4889 numbers. How many pages does this dictionary have?
排一本辞典的页码共用了4889个数字．这本辞典共有多少页？
<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">900 * 3</gadget>
<output>2_700</output>

<gadget id="calculator">9 + 180 + 2_700</gadget>
<output>2_889</output>

<gadget id="calculator">4_889 - 2_889</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 4</gadget>
<output>500</output>

<gadget id="calculator">999 + 500</gadget>
<output>1_499</output>

<result>1_499</result>