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:
5245 # 2258 @ 1333 # 9626 @ 7040 @ 9804

Ex Output:
11538


Ex Input:
16 @ 4157 @ 3953 @ 8863

Ex Output:
16989


Ex Input:
8207 # 9714 # 6474

Ex Output:

-7981