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:
826 # 6501 # 223 @ 9761 # 8863

Ex Output:
-5000


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

Ex Output:
6825


Ex Input:
6737 @ 4338 # 4389

Ex Output:

6686