Yingying has four kinds of stamps with denominations of 1, 2, 5, and 10 yuan. One day she sent 12 letters. The amount of stamps on each letter was different, and the number of stamps on each letter should be as few as possible. A total of 80 yuan stamps were posted, how many stamps did she post in total?
盈盈有1，2，5，10元面值的邮票四种，有一天她寄了12封信，每封信贴的邮票金额各不相同，且每封信贴的邮票张数要尽可能少．共贴了80元邮票，问她共贴了几张邮票？
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">4 + 10 + 9</gadget>
<output>23</output>

<result>23</result>