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:
6729 # 1204 # 5514 # 8079

Ex Output:
-8068


Ex Input:
16 @ 4157 @ 3953 @ 8863

Ex Output:
16989


Ex Input:
2817 @ 9784 @ 635

Ex Output:

13236