### Canonicalized Input Description:

An integer N (1 ≤ N ≤ 50,000), representing some quantity or size.
A list of tuples of size N, where each tuple contains:
  - A string (1 ≤ length ≤ 20), where each character is an English letter.
  - An integer (0 ≤ integer ≤ 10^5).
An integer M (1 ≤ M ≤ 20,000), representing some quantity or size.
A list of changes of size M, where each change is formatted as:
  - "+ string integer" or "- string", where:
    - The string (1 ≤ length ≤ 20) consists of English letters.
    - The integer (0 ≤ integer ≤ 10^5) is present only for the "+" format.

### Example Input:
```
4
example1 7
example2 3
example3 6
example4 0
1
+ example5 2
```

### Function Signature:
Write a function f(N, initial_members, M, changes) that takes in the input.
```python
def f(N: int, initial_members: List[Tuple[str, int]], M: int, changes: List[str]):
    '''
    N: an integer
    initial_members: a list of tuples, where each tuple contains a string and an integer
    M: an integer
    changes: a list of strings
    '''
```