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:
8737 - 2978 - 6717

Ex Output:
18432


Ex Input:
6667 - 31 + 1584 - 1542 - 6475 + 9319 + 2509 - 1895

Ex Output:
3198


Ex Input:
9951 + 4640 - 4577 + 9178 + 2294

Ex Output:

-1584