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:
2416 @ 4557 @ 9089 @ 8858

Ex Output:
24920


Ex Input:
5031 # 649 # 8975 @ 1853 # 5257 # 1383

Ex Output:
-9380


Ex Input:
1939 @ 2131 # 6110 @ 9154 @ 366 @ 3361 @ 1878

Ex Output:

12719