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:
4494 # 3982 # 3562 @ 341 @ 5494 # 3299 # 7182 # 8494

Ex Output:
-16190


Ex Input:
7556 # 7391 @ 2684

Ex Output:

2849