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:
597 + 4303 + 4507 + 4779 - 8079

Ex Output:
-4913


Ex Input:
2297 + 4208 + 9691 - 6995 + 738 + 1245 - 7806

Ex Output:
1216


Ex Input:
392 - 1081 - 6162 - 7756 + 2726 - 1999 + 2358 + 9016 - 6519

Ex Output:

9809