How many of the seven-digit numbers composed of 2 and 0 contain the four-digit number 2002?
用2和0组成的七位数中，包含2002这个四位数的有多少个．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">8 + 11</gadget>
<output>19</output>

<result>19</result>