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:
8571 - 5985 + 8912

Ex Output:
5644


Ex Input:
9982 + 267 - 3418 + 8741 - 63 - 1771 + 4720

Ex Output:

1506