There are some eight-digit numbers that are composed of numbers 1 and 2. Among these eight-digit numbers, how many of them have exactly five consecutive digits that are all 1?
有一些八位数都是由数字1和2组成，在这些八位数中，其中恰好连续五位都是1的有多少个．
<gadget id="calculator">4 + 6 + 2</gadget>
<output>12</output>

<result>12</result>