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

Input: Consider Input: 8899 # 4509 # 9411 # 7373

Output: -12394


Input: Consider Input: 7924 @ 8575 # 3974 @ 6720

Output: 19245


Input: Consider Input: 2644 @ 9600 @ 1887 # 3394


Output: 10737