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:
5507 @ 4243 @ 5897 @ 7115 # 6687 @ 3875 # 298 @ 1379 @ 1973

Ex Output:
23004


Ex Input:
1278 @ 4628 @ 2357 @ 3694 @ 5775 @ 8542 # 793

Ex Output:
25481


Ex Input:
9544 # 4349 # 3910 # 5338

Ex Output:

-4053