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:
397 + 1596 + 6102 + 2852 + 1239 + 3524 - 8019

Ex Output:
-6897


Ex Input:
4110 - 9440 + 557 + 7868 - 6315 + 2518 - 9049 + 3905 + 2052

Ex Output:
12014


Ex Input:
2845 + 4824 - 3778 + 197

Ex Output:

1602