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:
8899 # 4509 # 9411 # 7373

Ex Output:
-12394


Ex Input:
9924 @ 6266 # 7022 # 7976 # 2541 @ 5396

Ex Output:
4047


Ex Input:
6516 # 3321 # 185 @ 1523 # 9502 @ 9017 @ 7398

Ex Output:

11446