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:
4139 - 6541 - 2616 + 299 - 700 - 6684

Ex Output:
20381


Ex Input:
2474 + 4117 - 310 - 2018 - 6488 - 3458 - 1404

Ex Output:
12035


Ex Input:
6453 - 4160 - 6736 - 6049 - 2640 + 6379 - 8669 + 1499

Ex Output:

26829