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

605 @ 9301 @ 640 # 9148 # 8015
-6617

6420 @ 6956 @ 9478 # 4046
18808

7978 @ 3474 # 6909 @ 3818 @ 4858

13219