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:
4839 - 962 + 7552

Ex Output:
-1751


Ex Input:
775 - 7609 + 2326 + 8760 + 4505

Ex Output:
-7207


Ex Input:
8219 - 2457 + 1028 - 3861

Ex Output:

13509