Use 0, 1, 2, 3, 4, five numbers to form a four-digit number without repetition, what is the sum of all such four-digit numbers.
用0，1，2，3，4，五个数字组成没有重复的四位数，全体这样的四位数之和是多少．
<gadget id="calculator">240 * 1_000</gadget>
<output>240_000</output>

<gadget id="calculator">180 * 100</gadget>
<output>18_000</output>

<gadget id="calculator">0 + 1 + 2 + 3 + 4</gadget>
<output>10</output>

<gadget id="calculator">180 * 10</gadget>
<output>1_800</output>

<gadget id="calculator">180 * 1</gadget>
<output>180</output>

<gadget id="calculator">240_000 + 18_000 + 1_800 + 180</gadget>
<output>259_980</output>

<result>259_980</result>