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: 7640 @ 3347 @ 904
Example Output: 11891

Example Input: 2296 # 4729 # 7781 # 2633 # 6211 @ 849
Example Output:
-18209