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:
6472 # 6421 @ 7649 @ 4005

Ex Output:
11705


Ex Input:
2065 @ 3769 @ 9915 # 6270 @ 3929 @ 5328 @ 6079 @ 5250 @ 843

Ex Output:
30908


Ex Input:
7931 # 4242 @ 2100 # 1989

Ex Output:

3800