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:
4117 - 7011 - 9534 - 3901 - 9537 + 6979

Ex Output:
27121


Ex Input:
2432 + 588 - 6240 + 8670

Ex Output:
-586


Ex Input:
431 - 615 - 8899 + 4345

Ex Output:

5600