Add three numbers after 1997 to form a seven-digit number 1997□□□, if the seven-digit number can be divisible by 4, 5, and 6, what is the smallest possible value of the sum of the added three numbers?
在1997后面补上三个数字，组成一个七位数1997□□□，如果这七位数能被4、5、6整除，那么补上的三个数字的和的最小可能值是多少．
<gadget id="calculator">1 + 0 + 0</gadget>
<output>1</output>

<result>1</result>