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:
415 @ 1312 # 9916 @ 9168 @ 1911

Ex Output:
2890


Ex Input:
3303 @ 1775 # 9738 @ 1433 @ 5484 @ 2221

Ex Output:
4478


Ex Input:
9546 @ 5515 @ 6740 # 2069 # 921 # 9110 # 5067 # 3917 # 6434

Ex Output:

-5717