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:
2776 - 8931 + 2788 + 8315 - 6570 + 8385 - 2789

Ex Output:
1578


Ex Input:
9885 + 402 + 66 + 4818 + 2654 - 4301 + 2712 + 5842 - 2959

Ex Output:
651


Ex Input:
5101 + 1462 - 6096 - 5795 - 8619 + 6748 - 1737

Ex Output:

19138