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'.

2971 sottrazione 8718 aggiunta 2399 sottrazione 3945 aggiunta 4389 sottrazione 5797 sottrazione 7657
-16358