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:
155 + 7497 + 4675 - 2329 - 9080 - 5510 - 2336 + 8701

Ex Output:
-1463


Ex Input:
7208 + 2074 + 2796 - 8783

Ex Output:
11121


Ex Input:
306 + 2346 - 7752 + 7173

Ex Output:

-1461