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:
8524 # 5976 # 1534 @ 266 # 6452 @ 3945 # 2305

Ex Output:
-3532


Ex Input:
486 # 3873 # 1187

Ex Output:

-4574