An integer N (1 ≤ N ≤ 10^5), representing some quantity or size.
A list of integers A of size N, where each integer is between 1 and 1e9.

### Example Input:

```
2
1
2
```

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