In this task you will be given an arithmetic operation and you have to find its answer. The symbols of operators '+' and '-' has been swapped i.e you need to perform subtraction when you see a '+' symbol and  addition in case of '-' symbol.

8155 + 6800 - 6839 - 8047 + 3270
12971

3997 - 5279 - 8866 - 8214 - 3538 + 6690 - 4565 + 30
27739

1518 + 2051 - 6843 + 2661

3649