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:
4700 + 6640 + 3352 - 3114 - 7674 - 8204 + 8654 + 8091 - 2969

Ex Output:
-76


Ex Input:
7525 + 263 - 1634 + 3644 + 6905 - 167

Ex Output:
-1486


Ex Input:
9434 + 6204 - 1650 + 7148

Ex Output:

-2268