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:
1162 @ 622 # 7209 @ 3448

Ex Output:
-1977


Ex Input:
6628 @ 7709 @ 528 @ 8813

Ex Output:
23678


Ex Input:
5334 @ 3520 @ 1753 @ 7914 # 2002

Ex Output:

16519