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:
995 @ 6856 @ 867 # 7415 # 9581

Ex Output:
-8278


Ex Input:
3586 # 8254 # 4130 # 5426

Ex Output:
-14224


Ex Input:
4772 @ 4433 @ 3822 @ 397 @ 6418 @ 4228 # 2312

Ex Output:

21758