In the result of 333*777*625*125*25*5*16*8*4*2, how many zeros are there at the end?
333*777*625*125*25*5*16*8*4*2的结果中，末尾有多少个零．
<gadget id="calculator">4 + 3 + 2 + 1</gadget>
<output>10</output>

<result>10</result>