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

7640 @ 3347 @ 904
11891

4737 # 8536 @ 5633 # 1731 @ 3807 # 520 @ 1622
5012

2367 # 4658 @ 2677 @ 221

607