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:
6896 @ 8548 @ 1670 @ 7550 # 921

Ex Output:
23743


Ex Input:
1446 @ 5354 # 6450 # 2821 @ 2258

Ex Output:
-213


Ex Input:
5300 # 6558 # 8700

Ex Output:

-9958