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:
7217 @ 2604 @ 9974 @ 8133 @ 8987 # 6381 # 7662

Ex Output:
22872


Ex Input:
5460 # 8572 @ 5548

Ex Output:
2436


Ex Input:
381 @ 2677 @ 1618 @ 134 # 8544

Ex Output:

-3734