In this task you will be given an arithmetic operation in Italian and you have to find its answer. The operations 'addition' and 'subtraction' have been replaced with their italian translations i.e you need to perform addition when you see 'aggiunta' and subtraction in case of 'sottrazione'.

Let me give you an example: 10 sottrazione 7
The answer to this example can be: 3
Here is why: Here, 'sottrazione' represents the subtraction operation. So, the answer is 3 (10-7=3).

OK. solve this:
4644 aggiunta 2989 aggiunta 8409 aggiunta 6739 sottrazione 7597
Answer:
15184