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:
6738 - 471 + 8724

Ex Output:
-1515


Ex Input:
4226 - 3951 + 2613

Ex Output:
5564


Ex Input:
8295 + 2602 - 8676 - 7713 - 9518 + 9693 + 3606

Ex Output:

18301