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: 6420 @ 6956 @ 9478 # 4046

A: 18808
****
Q: 1559 # 9981 # 6881

A: -15303
****
Q: 9720 @ 6485 @ 1745 @ 728

A:
18678
****