A book has 133 pages, how many pages are used in number "1".
一本书有133页，编页时，数码"1"一共用了多少个．
<gadget id="calculator">10 + 10</gadget>
<output>20</output>

<gadget id="calculator">4 + 10 + 34</gadget>
<output>48</output>

<gadget id="calculator">20 + 48</gadget>
<output>68</output>

<result>68</result>