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:
6543 @ 9353 @ 2169 # 4681 @ 6446

Ex Output:
19830


Ex Input:
4558 @ 6469 @ 1154

Ex Output:
12181


Ex Input:
3390 # 9180 # 6868 # 3631 # 8556 # 5906

Ex Output:

-30751