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: 509 + 4840 + 5618 + 9163 + 802

Output: -19914


Input: Consider Input: 3677 + 3282 + 6324 + 6039 + 2578 - 7896 + 671 + 4192

Output: -11513


Input: Consider Input: 9897 + 8770 + 936


Output: 191