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:
42 + 6517 - 146 + 304 - 4759 + 148 - 3822

Ex Output:
1800


Ex Input:
4647 - 2106 + 6760 + 3296 - 9772

Ex Output:
6469


Ex Input:
3249 - 6540 + 9486 + 2074

Ex Output:

-1771