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:
573 - 2172 + 3067 + 6526 - 4690

Ex Output:
-2158


Ex Input:
9292 - 7471 - 1025 - 8458 + 444

Ex Output:
25802


Ex Input:
3306 + 88 + 7045 + 289

Ex Output:

-4116