How many five-digit numbers greater than 20,000 can be formed with the five numbers l, 2, 3, 4, and 5 and the hundreds digit is not 3 without repeated digits.
用l，2，3，4，5这五个数字可组成多少个比20000大且百位数字不是3的无重复数字的五位数．
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 + 24</gadget>
<output>78</output>

<result>78</result>