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:
932 # 7028 @ 5402 # 9015 @ 2110

Ex Output:
-7599


Ex Input:
7924 @ 8575 # 3974 @ 6720

Ex Output:
19245


Ex Input:
7570 @ 3122 @ 2167 # 7636

Ex Output:

5223