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:
1616 - 440 + 11

Ex Output:
2045


Ex Input:
240 - 438 + 497 - 5901 - 1960 + 4782 + 6400 - 4055

Ex Output:
915


Ex Input:
8610 - 1799 + 6949 - 2118 + 2200 + 7263 + 3601 - 9571 - 1914

Ex Output:

3999