Multiply the natural numbers starting from 1, namely: 1*2*3*4*5*…. When multiplying to 40, how many consecutive "0"s appear at the end of the product
把自然数从1开始作连乘积，即：1*2*3*4*5*…．当乘到40，乘积的末尾连续出现的多少个"0"
<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>