An integer N (1 ≤ N ≤ 100), representing some quantity or size.
An integer A (0 ≤ A ≤ N).
An integer B (0 ≤ B ≤ N).

### Example Input:

```
10 3 5
```

### Function Signature:
Write a function f(N, A, B) that takes in the input. 
def f(N: int, A: int, B: int): 
    ''' 
    N: an integer 
    A: an integer 
    B: an integer 
    '''