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:
306 + 2346 - 7752 + 7173

Ex Output:
-1461


Ex Input:
9713 + 8053 - 1782 + 6126 + 5918 + 968 - 2071 - 879 + 558

Ex Output:
-7178


Ex Input:
7235 - 5338 - 1653 - 6421 + 7693

Ex Output:

12954