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:
8771 @ 2575 # 7914 # 3691

Ex Output:
-259


Ex Input:
523 # 5860 # 778

Ex Output:
-6115


Ex Input:
4584 # 3955 @ 6224 @ 3884

Ex Output:

10737