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:
1649 + 4642 + 613 - 7051 - 8575

Ex Output:
12020


Ex Input:
7644 - 3099 - 3950 - 6068 - 2092 - 5622 + 5096

Ex Output:

23379