The rightmost digit of a six-digit number is 1. If this 1 is moved to the leftmost end of the number, the original six-digit number is three times the new six-digit number. What is the original six-digit number?
一个六位数的最右端的数字是1，如果把这个1移动到这个数的最左端，则原来的六位数是新六位数的3倍．则原来的六位数是多少．
<gadget id="calculator">42_857 * 10</gadget>
<output>428_570</output>

<gadget id="calculator">428_570 + 1</gadget>
<output>428_571</output>

<result>428_571</result>