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:
6420 @ 6956 @ 9478 # 4046

Ex Output:
18808


Ex Input:
9776 # 6717 # 9329 @ 6055 # 8635 @ 6132 @ 3374

Ex Output:
656


Ex Input:
181 @ 9859 # 7979 @ 2519 @ 2184 # 3210

Ex Output:

3554