Number of divisors
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Given an integer N, find the number of divisors of N that are divisible by 3.

Example 1:

Input : 6
Output: 2
Explanation: 1, 2, 3, 6 are divisors 
of 6 out of which 3 and 6 are divisible 
by 3.

Example 2:

Input: 10
Output: 0
Explanation: 1, 2, 5 and 10 are divisors 
of 10 but none of them are divisible by 3.


Your Task:

You don't need to read or print anything. Your task is to complete the function count_divisors() which takes N as input parameter and returns count of divisor which are divisible by 3.

Expected Time Complexity: O(sqrt(N))
Expected Space Complexity: O(1)


1 <= N <= 105

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