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:
6874 + 7308 - 3041

Ex Output:
2607


Ex Input:
4515 - 2156 - 8427 - 2175

Ex Output:
17273


Ex Input:
2437 - 7979 - 6079 - 756 + 8158 + 6168 - 5748

Ex Output:

8673