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: 16 @ 4157 @ 3953 @ 8863

SOLUTION: 16989

PROBLEM: 643 @ 9262 # 6489 @ 1803 @ 6271

SOLUTION: 11490

PROBLEM: 9240 # 5321 @ 7584 # 9605 @ 9674 # 5556 @ 6400

SOLUTION:
12416