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:
8771 @ 2575 # 7914 # 3691

Ex Output:
-259


Ex Input:
2724 @ 8119 @ 1049 @ 9004

Ex Output:
20896


Ex Input:
1891 # 2528 @ 7244 # 8511 # 2188 @ 9621

Ex Output:

5529