An integer N (1 ≤ N ≤ 3000), representing some quantity or size.
An integer X (1 ≤ X ≤ 2N).

### Example Input:

```
3 3
```

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