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:
8079 @ 5498 @ 5803 @ 711 # 9604 @ 7533

Ex Output:
18020


Ex Input:
2569 # 3660 # 2044 @ 3564 # 7082 @ 4306 @ 254 @ 4425

Ex Output:
2332


Ex Input:
571 # 6871 # 5104 @ 7447 @ 5068

Ex Output:

1111