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:
146 - 5209 + 892

Ex Output:
4463


Ex Input:
9634 + 5896 + 2965 + 6949 - 2226 + 9649 - 3599 - 7110

Ex Output:
-2890


Ex Input:
4479 - 9307 - 9542 - 1932 - 3817 - 525 + 8077 - 1090 + 1973

Ex Output:

20642