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.

Input: Consider Input: 306 + 2346 - 7752 + 7173

Output: -1461


Input: Consider Input: 5939 - 673 - 8282

Output: 14894


Input: Consider Input: 9549 + 21 - 6714 - 2406 - 2527 - 8527 + 1769


Output: 27933