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:
3407 @ 917 # 567 @ 5987 # 5936

Ex Output:
3808


Ex Input:
9645 @ 911 @ 6748 # 3005 # 3625 # 87 @ 3003 # 5587 # 1382

Ex Output:
6621


Ex Input:
8573 # 9661 # 6122 # 3456 # 780

Ex Output:

-11446