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.

Ex Input:
2603 + 1868 - 4242

Ex Output:
4977


Ex Input:
6355 - 3589 + 7310 - 5161 + 9803

Ex Output:
-2008


Ex Input:
1318 + 5780 + 8481 - 144 - 2832 + 4409 + 6723 - 1659 - 4026

Ex Output:

-15414