When printing a book, use one type for each number of its page number, such as "225" in "page 225", use three types, two of which are 2, and one is 5. There are 738 typefaces when the page number of an existing book is printed, ask how many pages this book has:
印刷一本书时，它的页码每位数字用一个铅字，如"第225页"的"225"要用三个铅字，其中两个2，一个5．现有一本书的页码印刷时要有738个铅字，问这本共有多少页：
<gadget id="calculator">549 / 3</gadget>
<output>183</output>

<gadget id="calculator">183 + 9 + 90</gadget>
<output>282</output>

<result>282</result>