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:
6904 # 1007 @ 9690 @ 9967 @ 9620 @ 4765

Ex Output:
39939


Ex Input:
3586 # 8254 # 4130 # 5426

Ex Output:
-14224


Ex Input:
2748 @ 5675 @ 1643 # 6705

Ex Output:

3361