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:
9835 @ 3285 # 8713 # 3066

Ex Output:
1341


Ex Input:
1086 # 7477 # 9664 @ 5904 # 8033 # 5563

Ex Output:
-23747


Ex Input:
7844 # 18 # 4929 @ 3074

Ex Output:

5971