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:
486 # 3873 # 1187

Ex Output:
-4574


Ex Input:
815 @ 7862 # 6166

Ex Output:
2511


Ex Input:
2899 # 7093 # 9292 @ 3867 # 4886 # 8865

Ex Output:

-23370