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:
6628 @ 7709 @ 528 @ 8813

Ex Output:
23678


Ex Input:
7769 @ 9568 @ 388 # 5101 # 8590 # 9063 # 5298 @ 7728

Ex Output:
-2599


Ex Input:
7175 # 5825 # 1904

Ex Output:

-554