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:
9982 + 267 - 3418 + 8741 - 63 - 1771 + 4720

Ex Output:
1506


Ex Input:
23 - 7991 - 1064 + 8364

Ex Output:
714


Ex Input:
2969 - 5124 + 649 - 5696 - 2940

Ex Output:

16080