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:
1731 # 9932 # 4056 # 2303

Ex Output:
-14560


Ex Input:
6796 # 5118 @ 4061 @ 2573 # 7960 @ 5889 # 7812 @ 3174

Ex Output:
1603


Ex Input:
1556 # 5859 @ 396 # 6065 # 4844 # 4466 @ 7045 # 8313

Ex Output:

-20550