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:
1256 - 3248 - 3709 - 3019

Ex Output:
11232


Ex Input:
1616 - 440 + 11

Ex Output:
2045


Ex Input:
6207 - 8623 + 1909

Ex Output:

12921