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:
1837 @ 4842 # 1682 @ 5953

Ex Output:
10950


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

Ex Output:
-3520


Ex Input:
3040 # 5501 # 7050 @ 4977 @ 98 @ 3087

Ex Output:

-1349