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.

Ex Input:
8571 - 5985 + 8912

Ex Output:
5644


Ex Input:
3055 - 3062 - 5311

Ex Output:
11428


Ex Input:
3715 - 7432 - 9570

Ex Output:

20717