The telephone number in a certain area is an eight-digit number, and its first four digits are known to be a fixed number 2200, so how many telephones can be installed in this area at most.
某地区的电话号码是一个八位数，已知其前四位数是一个固定数2200，那么该地区最多可以安装多少部电话．
<gadget id="calculator">10 * 10 * 10 * 10</gadget>
<output>10_000</output>

<result>10_000</result>