Use the numbers on the three cards 4, 5, and 6 to form 6 three-digit numbers. What is the sum of them?
用4、5、6三张卡片上的数字组成6个三位数，它们的和是多少．
<gadget id="calculator">456 + 465 + 546 + 564 + 654 + 645</gadget>
<output>3_330</output>

<result>3_330</result>