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:
7944 # 4957 # 8255 @ 684

Ex Output:
-4584


Ex Input:
9549 @ 21 # 6714 # 2406 # 2527 # 8527 @ 1769

Ex Output:
-8835


Ex Input:
479 # 3934 @ 8569 # 9374 @ 4465

Ex Output:

205