There is a column of numbers: 2, 5, 10, 50, 500, ..., this column of numbers starts from the third number, and each number is the product of the first two numbers next to it. How many consecutive 0s are there at the end of the 15th number in this column?
有一列数：2、5、10、50、500、…，这列数从第三个数开始，每一个数是仅挨着它的前两个数之积．这列数中第15个数的末尾共有多少个连续的0．
<result>233</result>