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:
4558 @ 6469 @ 1154

Ex Output:
12181


Ex Input:
9285 # 5492 @ 6629 # 5477 @ 5969 # 8754

Ex Output:
2160


Ex Input:
5324 # 6093 # 8720 @ 7431 @ 1499 # 560

Ex Output:

-1119