A tens digit only contains the number 1 or 2, and does not contain two consecutive digits 1. How many such tens digits are there?
一个十位数只含有数字l或2，且不含两个连续的数字1，一共有多少个这样的十位数？
<gadget id="calculator">2 ** 10</gadget>
<output>1_024</output>

<result>1_024</result>