Given the task definition and input, reply with output. 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

642 # 7863 @ 855 @ 3909 @ 4474 # 9340 # 6976 # 7034 @ 2816

-18517