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:
2821 @ 5327 # 3350 # 3607 @ 7010 @ 6824 # 9975 # 38

Ex Output:
5012


Ex Input:
4284 # 8233 @ 2781 # 2769 # 5560 @ 635 # 1706 @ 1965 @ 6794

Ex Output:
-1809


Ex Input:
8225 @ 7807 @ 9786 @ 3037

Ex Output:

28855