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:
3055 - 3062 - 5311

Ex Output:
11428


Ex Input:
7403 - 3327 + 5889 + 1034 + 1607 - 313

Ex Output:
2513


Ex Input:
3962 - 4437 + 3448

Ex Output:

4951