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: 1562 + 8343 + 8480

Output: -15261


Input: Consider Input: 3421 - 71 + 7643 - 8661 + 520 - 6536 + 9411

Output: 1115


Input: Consider Input: 3764 - 1457 - 2430


Output: 7651