In a column of numbers: 1, 2, 3, ..., 99, 100, how many times the number "0" appears in total.
在一列数：1，2，3，…，99，100中，数字"0"出现的次数一共是多少．
<gadget id="calculator">9 + 2</gadget>
<output>11</output>

<result>11</result>