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

Ex Output:
2219


Ex Input:
6960 # 4418 @ 5450 @ 8475

Ex Output:
16467


Ex Input:
7048 @ 7250 # 1773 @ 2795 # 1309 # 9051

Ex Output:

4960