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: 6420 @ 6956 @ 9478 # 4046

Output: 18808


Input: Consider Input: 1185 # 6431 @ 1326 # 2840 # 9276

Output: -16036


Input: Consider Input: 8218 # 7170 @ 461 # 1646 @ 3292 # 1900


Output: 1255