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:
9007 @ 6876 # 2672 # 3947 @ 6822 @ 806 @ 4508 @ 5112

Ex Output:
26512


Ex Input:
8062 # 9207 # 5882 # 7459

Ex Output:

-14486