In this task you will be given an arithmetic operation and you have to find its answer. The operators '+' and '-' have been replaced with new symbols. Specifically, '+' has been replaced with the symbol '@' and '-' with the symbol '#'. You need to perform the operations in the given equation return the answer

Ex Input:
605 @ 9301 @ 640 # 9148 # 8015

Ex Output:
-6617


Ex Input:
6597 @ 1596 # 358 # 9057 @ 993

Ex Output:
-229


Ex Input:
9971 # 4657 # 5577 @ 7674 @ 7001 # 358

Ex Output:

14054