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:
6091 - 9741 + 8943 + 4033 - 2984 + 4984 + 8503

Ex Output:
-7647


Ex Input:
7978 + 3474 - 6909 + 3818 + 4858

Ex Output:

2737