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:
1971 - 5591 + 4038 + 5571

Ex Output:
-2047


Ex Input:
7525 + 263 - 1634 + 3644 + 6905 - 167

Ex Output:
-1486


Ex Input:
322 + 9284 + 98 + 4634

Ex Output:

-13694