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

Ex Output:
-3507


Ex Input:
440 @ 5472 # 6900 # 3389

Ex Output:
-4377


Ex Input:
5600 @ 5424 @ 60 @ 1857 # 5665

Ex Output:

7276