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:
9806 @ 7051 @ 6703 @ 4233 # 276

Ex Output:
27517


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

Ex Output:
22872


Ex Input:
9731 # 3683 @ 3979 # 6650

Ex Output:

3377