[C#]Loops – 13*

* Write a program that calculates for given N how many trailing zeros present at the end of the number N!. Examples:
N = 10  N! = 3628800  2
N = 20  N! = 2432902008176640000  4
Does your program work for N = 50 000?
Hint: The trailing zeros in N! are equal to the number of its prime divisors of value 5. Think why!