给定一个正整数n，计算n!的尾部0的个数。

输入：输入数据有若干行。每行上有一个正整数n，对应一种情形。

输出：对于每一种情形，先输出“Case #: ”（#为序号，从1起），然后输出n的值，逗号，结果，换行。-Given a positive integer n, compute the number n! tail 0. Input: Input data have a number of lines. Each line has a positive integer n, corresponding to a situation. Output: For each case, the first output " Case#:"　(# is the serial number, starting from 1), and then output the value of n, a comma, the result, change the line.