10 s   128 MB

Description

Sifar is a malay word for zero or 0. In mathematics, trailing sifar is a sequence of 0s in the decimal representation of a number after which no other digits follow.

The number of trailing sifar in the decimal representation of N! (5 <= N <= 1,000,000) is simply the multiplicity of the prime factor 5 in N!. Given a decimal integer N, you are to find the number of trailing sifar for N! For example, 10! = 3,628,800. Thus, the number of trailing sifar for 10! is 2.

Input

Each line of input contains an integer N where 5 <= N <= 1,000,000. The input is terminated with a line containing 0.

Output

For each test case, the output contains a line in the format Case #x: M, where x is the case number (starting from 1) and M is the number of trailing sifar for N!

Sample Output

5
10
118
211
0
Case #1: 1
Case #2: 2
Case #3: 27
Case #4: 51

Source

2013 ACM-ICPC Malaysia National Programming Contest