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

1559 # 9981 # 6881
-15303

1278 @ 4628 @ 2357 @ 3694 @ 5775 @ 8542 # 793
25481

6207 # 8623 @ 1909

-507