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:
345 @ 1076 @ 7948 # 854

Ex Output:
8515


Ex Input:
7217 @ 2604 @ 9974 @ 8133 @ 8987 # 6381 # 7662

Ex Output:
22872


Ex Input:
897 # 398 @ 5517 # 5955 # 1456 # 5571 @ 2022

Ex Output:

-4944