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:
1709 # 2270 # 1077 # 9681

Ex Output:
-11319


Ex Input:
992 # 6304 @ 9489 # 6814 # 5448 @ 4565

Ex Output:
-3520


Ex Input:
8513 @ 7344 # 6406 # 9418 @ 147 # 2304 # 6410

Ex Output:

-8534