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:
872 @ 547 # 4476 @ 6631 # 8433 # 452 @ 5115

Ex Output:
-196


Ex Input:
995 @ 6856 @ 867 # 7415 # 9581

Ex Output:
-8278


Ex Input:
3249 # 6540 @ 9486 @ 2074

Ex Output:

8269