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: 8717 @ 6135 # 2706

Output: 12146


Input: Consider Input: 8172 @ 6594 # 2768 # 40 @ 9214 @ 3626


Output: 24798