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:
440 @ 5472 # 6900 # 3389

Ex Output:
-4377


Ex Input:
8099 # 538 # 2120 # 1799

Ex Output:

3642


