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:
992 # 6304 @ 9489 # 6814 # 5448 @ 4565

Ex Output:
-3520


Ex Input:
1774 # 6033 # 3757 @ 3570 @ 6463 # 5537

Ex Output:
-3520


Ex Input:
6131 @ 9369 # 3111 @ 488 # 1812 # 8329 # 4223

Ex Output:

-1487