SpecialNum

PROBLEM STATEMENT
A number is considered special when the product of its digits is equal to the
sum of its digits.  22 is a special number because 2+2 = 2*2.

You will be given two numbers as inputs and must determine the number of
special numbers between the two given inputs, inclusive.

DEFINITION
Class: SpecialNum
Parameters: int, int
Returns: int
Method signature (be sure your method is public):  int count(int min, int max);

TopCoder will ensure the validity of the inputs.  Inputs are valid if all of
the following criteria are met:
- min is less than or equal to max
- min and max are both in the range 1 to 999,999,999 inclusive

EXAMPLES
1. min = 1, max = 5
all the numbers in this range are special, so the method returns 5.

2. min = 15, max = 98
only 22 is special in this range, so the method returns 1.

3. min = 200, max = 300
both 213 and 231 are special, so the method returns 2.

4. min = 82111111, max = 82111111
returns 1

5. min = 1, max = 1000000
returns 98