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:
7930 - 2835 - 1925 - 6613

Ex Output:
19303


Ex Input:
8571 - 5985 + 8912

Ex Output:
5644


Ex Input:
5021 - 6901 + 338 - 5097 + 4093 + 6018 - 1590 - 8097

Ex Output:

16257