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:
9273 # 8850 @ 3050

Ex Output:
3473


Ex Input:
7539 # 9710 # 800 # 5609

Ex Output:
-8580


Ex Input:
2980 # 6793 # 1879 @ 5728 # 4199

Ex Output:

-4163