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:
1737 # 3662 # 9496 @ 694

Ex Output:
-10727


Ex Input:
4956 # 4259 # 3459

Ex Output:
-2762


Ex Input:
997 # 8965 @ 8736

Ex Output:

768