How much is 975*935*972*? To make the last four numbers of this continuous product all be "0", what is the minimum number that should be filled in the brackets?
975*935*972*多少，要使这个连乘积的最后四个数字都是"0"，在括号内最小应填什么数？
<gadget id="calculator">2 * 2 * 5</gadget>
<output>20</output>

<result>20</result>