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:
8717 @ 6135 # 2706

Ex Output:
12146


Ex Input:
7272 @ 8958 # 7231 @ 6616

Ex Output:
15615


Ex Input:
7926 @ 3998 # 1564 # 7707 # 3584

Ex Output:

-931