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:
6557 @ 9368 # 307 @ 2982 # 8398 # 9241 # 4697 # 6790

Ex Output:
-10526


Ex Input:
1529 @ 8982 @ 3470 @ 7611 @ 9000

Ex Output:

30592