Factorial Challenge

Here's a challenge that's a bit more mathematical in nature. Write a program that determines the number of trailing zeros at the end of X! (X factorial), where X is an arbitrary number. For instance, 5! is 120, so it has one trailing zero. (How can you handle extremely values, such as 100!?) Example Input: An integer e.g 5! Output: No of trailing zeros in answer, 5! Is 120 so it has one trail