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:
1221 @ 4619 # 3319 @ 2958

Ex Output:
5479


Ex Input:
2186 # 2436 # 4269 # 2175 @ 4101 # 2723 @ 6192 # 7530

Ex Output:
-6654


Ex Input:
742 # 3521 # 9085 @ 4110 @ 5680 # 2667

Ex Output:

-4741