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:
4956 # 4259 # 3459

Ex Output:
-2762


Ex Input:
4449 @ 4019 @ 7637

Ex Output:
16105


Ex Input:
42 # 2129 @ 9311 # 7688 @ 4005 # 89 # 8592 @ 660 @ 4825

Ex Output:

345