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:
7163 + 3916 + 4926 + 2532 - 2743 - 5389 + 7290

Ex Output:
-3369


Ex Input:
839 + 2740 + 8565 - 4593 - 2060 - 2846 - 2159 + 7955

Ex Output:

-6763