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:
9879 # 8585 @ 4078 # 6210 @ 7239 @ 3002 # 2455 @ 9817

Ex Output:
16765


Ex Input:
4400 @ 9261 @ 3016

Ex Output:
16677


Ex Input:
4172 @ 1192 @ 9642 # 1443 # 6665 # 6904

Ex Output:

-6