The password on the mother's lockbox is a two-digit number, with numbers 1, 2, and 3 on the left, and 4, 5, 6, 7, 8, and 9 on the right. But my mother forgot the previously set password, how many times will she try at most to open the password box.
妈妈的密码箱上的密码是一个两位数，左边有数字1、2、3，右边有4、5、6、7、8、9．可是妈妈把先前设好的密码忘记了，她最多要试多少次才能把密码箱打开．
<gadget id="calculator">3 * 6</gadget>
<output>18</output>

<result>18</result>