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: 397 + 1596 + 6102 + 2852 + 1239 + 3524 - 8019

Output: -6897


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

Output: -2158


Input: Consider Input: 162 + 3248 - 761 - 2406 - 3170


Output: 3251