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'.

Input: Consider Input: 8530 sottrazione 4910 sottrazione 2625 sottrazione 6130

Output: -5135


Input: Consider Input: 2115 aggiunta 7193 aggiunta 3050 aggiunta 2454 aggiunta 9492

Output: 24304


Input: Consider Input: 1061 sottrazione 4759 sottrazione 32


Output: -3730