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:
2269 # 7857 @ 1906 @ 1098 # 6308 # 1142 @ 2063

Ex Output:
-7971


Ex Input:
826 # 6501 # 223 @ 9761 # 8863

Ex Output:
-5000


Ex Input:
6508 @ 8841 # 6871 @ 6635

Ex Output:

15113