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:
4089 @ 276 @ 7408 # 9945 @ 4656

Ex Output:
6484


Ex Input:
9466 # 395 @ 5036 # 8315 @ 1723

Ex Output:
7515


Ex Input:
1663 # 7745 @ 1186

Ex Output:

-4896