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

You are given a 0-indexed integer array nums and an integer value.
In one operation, you can add or subtract value from any element of nums.

For example, if nums = [1,2,3] and value = 2, you can choose to subtract value from nums[0] to make nums = [-1,2,3].

The MEX (minimum excluded) of an array is the smallest missing non-negative integer in it.

For example, the MEX of [-1,2,3] is 0 while the MEX of [1,0,3] is 2.

Return the maximum MEX of nums after applying the mentioned operation any number of times.
 
Please complete the following python code precisely:
```python
class Solution:
    def findSmallestInteger(self, nums: List[int], value: int) -> int:
```