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:
6597 @ 1596 # 358 # 9057 @ 993

Ex Output:
-229


Ex Input:
120 # 2644 @ 4589

Ex Output:
2065


Ex Input:
3109 @ 2071 # 9237 @ 2291 @ 3816 # 8731 @ 8655

Ex Output:

1974