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:
6800 + 2564 + 8444 + 1912

Ex Output:
-6120


Ex Input:
7169 + 1918 - 7501 + 5160 + 9033 - 3341 + 4286

Ex Output:
-2386


Ex Input:
9282 - 5471 + 9965

Ex Output:

4788