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:
7803 @ 6524 @ 7077 # 1627 # 3959

Ex Output:
15818


Ex Input:
6557 @ 9368 # 307 @ 2982 # 8398 # 9241 # 4697 # 6790

Ex Output:
-10526


Ex Input:
7909 @ 9280 # 9502

Ex Output:

7687