Among the 1999 numbers 1-1999, how many numbers (at least one digit) will be carried when added to 4567.
在1-1999这1999个数中，有多少个数与4567相加时(至少有一个数位)发生进位．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">4 * 4 * 3</gadget>
<output>48</output>

<gadget id="calculator">5 * 5 * 4 * 3</gadget>
<output>300</output>

<gadget id="calculator">2 + 6 + 48 + 300</gadget>
<output>356</output>

<gadget id="calculator">1_999 - 356</gadget>
<output>1_643</output>

<result>1_643</result>