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:
2671 + 3943 - 5777 + 7680

Ex Output:
-3175


Ex Input:
6040 + 5815 + 9288 + 5107 + 5697 + 7993 - 672 + 8297

Ex Output:
-35485


Ex Input:
5495 - 7575 + 9675 - 3486 - 9879

Ex Output:

16760