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:
427 # 7974 # 7564 @ 2404 # 4955 # 1239 # 1518 @ 906

Ex Output:
-19513


Ex Input:
5345 @ 1253 @ 6978 @ 8118 # 4199 @ 6135 # 5876 @ 403

Ex Output:

18157