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
--------
Question: 8899 # 4509 # 9411 # 7373

Answer: -12394


Question: 9039 @ 4996 @ 845 # 5409

Answer: 9471


Question: 6971 @ 3677 # 2729

Answer:
7919