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:
9566 # 6244 @ 3039 # 947 # 6321 @ 7732

Ex Output:
6825


Ex Input:
1529 @ 8982 @ 3470 @ 7611 @ 9000

Ex Output:
30592


Ex Input:
351 @ 7601 # 6810 # 2273 # 1862

Ex Output:

-2993