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: 1616 - 440 + 11

Output: 2045


Input: Consider Input: 573 - 2172 + 3067 + 6526 - 4690

Output: -2158


Input: Consider Input: 6940 + 2730 - 2918 - 5236 + 3128 + 1064 - 7797 + 5474 + 6921


Output: 3574