An integer N (1 ≤ N ≤ 2×10^5), representing some quantity or size.
An integer K (1 ≤ K ≤ N+1), representing another quantity or size.

### Example Input:

```
3
2
```

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