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:
2653 @ 9718 # 3237 @ 2973 # 6895 # 18

Ex Output:
5194


Ex Input:
290 @ 5200 # 3274 # 8548

Ex Output:
-6332


Ex Input:
73 @ 9194 # 3691

Ex Output:

5576