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:
1737 # 3662 # 9496 @ 694

Ex Output:
-10727


Ex Input:
2367 @ 4877 @ 8467 @ 5488 # 987 # 8899

Ex Output:
11313


Ex Input:
9594 @ 7409 # 2702 @ 3061 # 6893 @ 85 # 4207

Ex Output:

6347