    
An integer a (1 ≤ a ≤ 10^9), representing some quantity.
An integer b (1 ≤ b ≤ 10^9), representing some quantity.

### Example Input:

```
4 12
```

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