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:
2875 - 138 + 917 + 4037 - 6642

Ex Output:
4701


Ex Input:
2759 - 7972 - 7615 + 151

Ex Output:
18195


Ex Input:
9565 - 4506 + 5081 - 990 - 7230

Ex Output:

17210