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:
1278 + 4628 + 2357 + 3694 + 5775 + 8542 - 793

Ex Output:
-22925


Ex Input:
4286 + 2085 - 8347

Ex Output:
10548


Ex Input:
2128 - 6858 - 2177 + 8648

Ex Output:

2515