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:
643 @ 9262 # 6489 @ 1803 @ 6271

Ex Output:
11490


Ex Input:
4839 # 9558 @ 1236 # 8758 # 3209

Ex Output:
-15450


Ex Input:
9088 @ 5222 @ 1125 # 4907 @ 5742

Ex Output:

16270