I have two lists of integers of equal length. I would like to add each element of the first list to its corresponding element of the second list using the line:

```
complete_list = [first_list[i] + second_list[i] for i in range(len(first_list))]

```

However, some elements of first\_list are special numbers and I would like to exempt them from the above operation whilst having the other elements added to make complete\_list. Thanks!