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:
3615 @ 7429 @ 6810 # 207 @ 1232 # 5621 @ 6745

Ex Output:
20003


Ex Input:
2763 @ 869 # 8299

Ex Output:
-4667


Ex Input:
4488 @ 1476 # 9518 @ 8527 # 8946 # 712 @ 425

Ex Output:

-4260