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:
240 - 438 + 497 - 5901 - 1960 + 4782 + 6400 - 4055

Ex Output:
915


Ex Input:
8571 - 5985 + 8912

Ex Output:
5644


Ex Input:
7932 - 671 + 6005 + 5137

Ex Output:

-2539