An integer N (1 ≤ N ≤ 100), representing some quantity or size.
A list of integers B of size N, where each integer is between 1 and 100.
A list of integers C of size N, where each integer is between 1 and 100.

### Example Input:

```
5
3 2 2 4 1
1 2 2 2 1
```

### Function Signature:
Write a function f(N, B, C) that takes in the input. 
def f(N: int, B: List[int], C: List[int]):
    ''' 
    N: an integer 
    B: a list of integers
    C: a list of integers
    '''