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:
1815 - 3167 - 773

Ex Output:
5755


Ex Input:
6142 + 418 - 7535 - 7185 - 5518 + 7544 - 1019 - 938 - 9490

Ex Output:
29865


Ex Input:
1852 + 4381 - 7149 + 4931 + 4029

Ex Output:

-4340