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:
815 @ 7862 # 6166

Ex Output:
2511


Ex Input:
6896 @ 8548 @ 1670 @ 7550 # 921

Ex Output:
23743


Ex Input:
3250 # 1653 # 7622 # 2461 # 2424

Ex Output:

-10910