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:
9889 @ 8457 # 4692

Ex Output:
13654


Ex Input:
6267 @ 3545 @ 4904 @ 4580

Ex Output:
19296


Ex Input:
4437 # 8247 # 943 # 6684 @ 7670

Ex Output:

-3767