A four-digit number that satisfies the following properties is called a "good number": its ones digit is greater than the tens digit, the tens digit is greater than the hundreds digit, the hundreds digit is greater than the thousands digit, and the difference between any adjacent two digits does not exceed 3 ． For example, 1346 and 2579 are good numbers, but 1567 is not a good number. May I ask: How many good numbers are there in total?
满足下面性质的四位数称为"好数"：它的个位比十位大，十位比百位大，百位比千位大，并且任意相邻两位数字的差都不超过3．例如1346、2579是好数，但1567就不是好数．请问：一共有多少个好数？
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 15 + 12 + 3 + 12 + 6 + 6 + 3 + 18</gadget>
<output>81</output>

<result>81</result>