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

Example Input: 8899 # 4509 # 9411 # 7373
Example Output: -12394

Example Input: 8915 @ 8709 # 6716 @ 4326
Example Output: 15234

Example Input: 6828 # 2164 # 1838
Example Output:
2826