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:
2144 - 4158 + 4207

Ex Output:
2095


Ex Input:
3782 + 4127 - 1265 - 1395 + 2430 + 6990 + 8573 + 8170

Ex Output:
-23848


Ex Input:
3930 + 6240 - 948 - 4640 - 1376 - 103 - 8537

Ex Output:

13294