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:
9629 @ 3687 @ 328

Ex Output:
13644


Ex Input:
5235 @ 3917 @ 4902 @ 3831 # 6517

Ex Output:
11368


Ex Input:
1855 # 4606 @ 3660 # 9303 @ 6586

Ex Output:

-1808