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

Q: 7775 # 9805 # 8727

A: -10757
****
Q: 1559 # 9981 # 6881

A: -15303
****
Q: 6518 @ 2519 # 9928 @ 1421

A:
530
****