Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given an integer array nums of positive integers, return the average value of all even integers that are divisible by 3.
Note that the average of n elements is the sum of the n elements divided by n and rounded down to the nearest integer.
 
Please complete the following python code precisely:
```python
class Solution:
    def averageValue(self, nums: List[int]) -> int:
```