The book "Hope Cup Mathematics Ability Training Course (Grade 4)" has 160 pages. In its page numbers, how many times does the number "2" appear in total?
《希望杯数学能力培训教程(四年级)》一书有160页，在它的页码中，数字"2"共出现了多少次．
<gadget id="calculator">2 + 11 + 9 + 11 + 3</gadget>
<output>36</output>

<result>36</result>