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:
2020 @ 862 # 5780

Ex Output:
-2898


Ex Input:
7775 # 9805 # 8727

Ex Output:
-10757


Ex Input:
7347 # 9135 # 9303 @ 1078 # 3054 @ 4217 @ 4075

Ex Output:

-4775