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:
6506 # 8715 @ 5800 @ 1904 @ 3642

Ex Output:
9137


Ex Input:
3462 @ 9743 @ 8298

Ex Output:
21503


Ex Input:
6478 @ 3479 # 9339 # 4389

Ex Output:

-3771