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:
4844 # 1525 @ 1894 # 2506

Ex Output:
2707


Ex Input:
8571 # 5985 @ 8912

Ex Output:
11498


Ex Input:
5459 # 6869 @ 2431 # 7219 @ 881 @ 6169 # 2536 # 6867 @ 4622

Ex Output:

-3929