A five-digit number is a multiple of 4, how many such five-digit numbers are there?
一个五位数的各位数字都是末位数字4的倍数，这样的五位数有多少个？
<gadget id="calculator">2 * 3 * 3 * 3 * 1</gadget>
<output>54</output>

<result>54</result>