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:
6896 @ 8548 @ 1670 @ 7550 # 921

Ex Output:
23743


Ex Input:
6884 @ 145 # 2208 # 5356 # 3578 @ 606

Ex Output:
-3507


Ex Input:
2603 @ 1868 # 4242

Ex Output:

229