793. Preimage Size of Factorial Zeroes Function

Let f(x) be the number of zeroes at the end of x!. Recall that x! = 1 * 2 * 3 * ... * x and by convention, 0! = 1. - For example, f(3) = 0 because 3! = 6 has no zeroes at the end, while f(11) = 2 because 11! = 39916800 has two zeroes at the end. Given an integer k, return the number of non-negative integers x have the property that f(x) = k. Example 1: Input: k = 0 Output: 5 Explanation: 0!,