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'.
Q: 6409 sottrazione 8124 aggiunta 4794 aggiunta 3505 aggiunta 1716
A: 
8300