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:
6284 + 1234 + 9639 + 1470 + 4137 + 9445 + 5309 + 9797 - 4507

Ex Output:
-30240


Ex Input:
138 + 3973 - 6085 - 3324 + 6921 + 4411 + 1113 + 8310

Ex Output:
-15181


Ex Input:
8308 + 643 - 2716

Ex Output:

10381