Choose 6 positive integers from 1 to 900, so that the mantissa of the product of these 6 consecutive positive integers is exactly 4 0s, how many choices are there?
从1到900中选6个正整数，使这6个连续正整数的积的尾数恰好为4个0，有多少种选法？
<gadget id="calculator">12 + 5</gadget>
<output>17</output>

<result>17</result>