The (Intermediate Course for Primary School Mathematical Olympiad) compiled by the Municipal Olympic School is divided into two volumes, the first volume is numbered from 1, and the numbers of the two volumes share 1140 numbers (words), and the first volume is more than the second volume 4 pages, how many pages are there in Volume 1?
市奥校编写的(小学数学奥林匹克中级教程)分上、下两册，每册的开头都是从1开始编号，两册书的编号共用了1140个数码(字)，且上册比下册多4页，上册有多少页．
<gadget id="calculator">2 * 90</gadget>
<output>180</output>

<gadget id="calculator">1_140 - 9 - 180</gadget>
<output>951</output>

<gadget id="calculator">951 / 3</gadget>
<output>317</output>

<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">317 + 99</gadget>
<output>416</output>

<gadget id="calculator">416 + 4</gadget>
<output>420</output>

<gadget id="calculator">420 / 2</gadget>
<output>210</output>

<result>210</result>