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:
171 - 966 + 1234 - 1722 - 4406 + 9773 - 1161

Ex Output:
-2581


Ex Input:
1344 + 7632 - 4322

Ex Output:
-1966


Ex Input:
4218 - 7094 - 8668 + 3763

Ex Output:

16217