From 1 to 20, choose three numbers at random so that their sum is divisible by 4. How many different choices are there?
从1至20中，任意选三个数，使其和都能被4整除，共有多少种不同的选法．
<gadget id="calculator">1 + 1 + 2</gadget>
<output>4</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">10 + 24 + 24</gadget>
<output>58</output>

<result>58</result>