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:
2759 - 7972 - 7615 + 151

Ex Output:
18195


Ex Input:
8220 - 9787 + 1100 - 7425

Ex Output:
24332


Ex Input:
5331 - 5004 + 4821 + 9023 + 2624 - 7388 + 6189 - 1391

Ex Output:

-3543