975*936*972*□, to make the last four numbers of the product of this multiplication formula all be 0, what is the minimum number in □.
975*936*972*□，要使这个连乘式的积末尾四数字都是0，□内最小应填多少．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>