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

### Example Input:

```
13 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 
    '''