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:
5113 - 8987 - 452

Ex Output:
14552


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

Ex Output:
1578


Ex Input:
6135 - 9642 - 804 - 8482 + 8373 + 6599 + 858 - 1910 - 9697

Ex Output:

20840