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

Ex Output:
3198


Ex Input:
4286 + 2085 - 8347

Ex Output:
10548


Ex Input:
7337 + 5801 - 8640 - 4143 - 2557

Ex Output:

16876