In this task you will be given an arithmetic operation and you have to find its answer. The operators '+' and '-' have been replaced with new symbols. Specifically, '+' has been replaced with the symbol '@' and '-' with the symbol '#'. You need to perform the operations in the given equation return the answer

Ex Input:
2307 # 9363 @ 4926 @ 5635

Ex Output:
3505


Ex Input:
9673 @ 7136 # 4171 # 8296 @ 655

Ex Output:
4997


Ex Input:
5276 @ 7729 # 8921 # 9551 @ 430 @ 2069

Ex Output:

-2968