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

Ex Input:
2367 @ 4877 @ 8467 @ 5488 # 987 # 8899

Ex Output:
11313


Ex Input:
6420 @ 6956 @ 9478 # 4046

Ex Output:
18808


Ex Input:
1425 # 9888 @ 5520 # 4371 @ 6430 @ 248

Ex Output:

-636