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:
1559 # 9981 # 6881

Ex Output:
-15303


Ex Input:
9954 @ 4250 # 4835 @ 6737 # 8434 # 6461 @ 1008

Ex Output:
2219


Ex Input:
8681 @ 1011 @ 3047 # 1686 # 6461

Ex Output:

4592