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:
4101 + 2536 - 502

Ex Output:
2067


Ex Input:
1312 - 814 - 8592 - 4040 - 5158 + 6817

Ex Output:
13099


Ex Input:
2460 + 8870 + 3877 - 805 + 9022 + 4919

Ex Output:

-23423