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:
9285 # 5492 @ 6629 # 5477 @ 5969 # 8754

Ex Output:
2160


Ex Input:
5513 @ 1221 @ 8910 @ 8422

Ex Output:
24066


Ex Input:
640 @ 7414 @ 3173 # 5704 @ 3257 @ 3878 @ 6272

Ex Output:

18930