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:
2448 @ 5284 # 6313 @ 7761 @ 4601 @ 6800

Ex Output:
20581


Ex Input:
3615 @ 7429 @ 6810 # 207 @ 1232 # 5621 @ 6745

Ex Output:
20003


Ex Input:
6362 # 7931 # 7350 @ 154 # 7097

Ex Output:

-15862