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:
6506 # 8715 @ 5800 @ 1904 @ 3642

Ex Output:
9137


Ex Input:
6979 # 7807 @ 3778 # 1362 @ 8374 # 3189 @ 5988

Ex Output:
12761


Ex Input:
1847 @ 1635 @ 8323 @ 8480 @ 104 # 907

Ex Output:

19482