An integer N (1 ≤ N ≤ 2 x 10^5), representing some quantity or size.
An integer X (-10^8 ≤ X ≤ 10^8).
An integer D (-10^8 ≤ D ≤ 10^8).

### Example Input:

```
3
4
2
```

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