The telephone number of City H has seven numbers, the first number of which is neither 0 nor 1. How many phone numbers in this city and numbers do not repeat?
H市的电话号码有七个数字，其中第一个数字不为0，也不为1．这个城市、数字不重复的电话号码共有多少个．
<gadget id="calculator">8 * 9 * 8 * 7 * 6 * 5 * 4</gadget>
<output>483_840</output>

<result>483_840</result>