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:
8901 - 4785 + 1969 + 5985 + 517 + 5651 + 170

Ex Output:
-606


Ex Input:
8137 + 5006 - 7743 + 1478

Ex Output:
9396


Ex Input:
9616 - 8145 + 562 + 3160 - 8906 - 360 + 9291 + 7609 + 460

Ex Output:

5945