An integer \(X\) (1 ≤ \(X\) ≤ 10^9), representing some positive quantity.
An integer \(Y\) (1 ≤ \(Y\) ≤ 10^9), representing another positive quantity.

### Example Input:

```
4 12
```

### Function Signature:
Write a function f(X, Y) that takes in the input.
```python
def f(X: int, Y: int):
    ''' 
    X: a positive integer
    Y: another positive integer
    '''
```