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:
8441 @ 2924 # 9024 @ 6661 @ 7034 # 4821 # 4921

Ex Output:
6294


Ex Input:
6203 # 8978 # 1139 @ 240 # 4716

Ex Output:
-8390


Ex Input:
7924 @ 8575 # 3974 @ 6720

Ex Output:

19245