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:
4460 @ 9143 # 6720 # 8379 @ 1636 # 6526

Ex Output:
-6386


Ex Input:
6454 @ 9714 @ 523 @ 8713 # 3656

Ex Output:

21748