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:
5110 # 9803 @ 2485 # 1678

Ex Output:
-3886


Ex Input:
2307 # 9363 @ 4926 @ 5635

Ex Output:
3505


Ex Input:
2467 @ 3707 @ 5147 # 4618

Ex Output:

6703


