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:
2678 # 5467 @ 8355 # 3124 # 5654

Ex Output:
-3212


Ex Input:
9450 @ 2784 @ 6824 # 2640 # 2338 @ 688

Ex Output:

14768