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:
7053 - 797 + 1011 - 43 - 2798 - 1572 - 4498

Ex Output:
15750


Ex Input:
2255 + 2266 + 4537

Ex Output:

-4548