At the end of 1*2*3*4*5*...*99, how many consecutive zeros are there?
在1*2*3*4*5*…*99的末尾，连续有多少个零．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">16 + 6</gadget>
<output>22</output>

<result>22</result>