TASK DEFINITION: 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
PROBLEM: 9487 # 9520 @ 4047

SOLUTION: 4014

PROBLEM: 6420 @ 6956 @ 9478 # 4046

SOLUTION: 18808

PROBLEM: 6020 # 9992 @ 859 @ 553 # 8852 # 5815 @ 8563 @ 807

SOLUTION:
-7857