Xiao Ming borrowed a story book. In order to read it as soon as possible, he made a reading plan: in the previous week, he read the remaining pages (1/8), (1/7), (1/6), (1/5), (1/4), (1/3), (1/2). As a result, there are still 30 pages that I haven't read a week later. How many pages are there in this storybook?
小明借了一本故事书，为了尽快看完，他制定了一个看书计划：前一周里，每天依次看剩下页数的(1/8)、(1/7)、(1/6)、(1/5)、(1/4)、(1/3)、(1/2)．结果一周后还有30页没看，这本故事书共有多少页？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">30 / (1/2) / (2/3) / (3/4) / (4/5) / (5/6) / (6/7) / (7/8)</gadget>
<output>240</output>

<result>240</result>