From the natural numbers 1, 2, 3, 4, ..., 1997, how many numbers can be taken at most so that the difference between any two of these numbers is not equal to 8.
从1，2，3，4，…，1997这些自然数中，最多可以取多少个数，能使这些数中任意两个数的差都不等于8．
<gadget id="calculator">250 / 2</gadget>
<output>125</output>

<gadget id="calculator">125 * 8</gadget>
<output>1_000</output>

<result>1_000</result>