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:
335 + 4730 + 4604 - 5559 + 7282 - 7812

Ex Output:
-2910


Ex Input:
245 - 7701 - 3811 + 2271 - 3036

Ex Output:

12522