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:
1559 @ 760 # 5027 # 8544 @ 4623 # 9238

Ex Output:
-15867


Ex Input:
8137 @ 5006 # 7743 @ 1478

Ex Output:
6878


Ex Input:
8014 # 3758 @ 5749 # 1877 @ 1877 # 7742

Ex Output:

2263