To make the last five digits of the product of 145*48*56*280*□ all be exactly 0, what is the smallest natural number that should be filled in □.
要使145*48*56*280*□的积的末五位上的数字恰好都是0，□中应填的最小自然数是多少．
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<result>125</result>