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:
2342 # 5338 @ 345 @ 9010 @ 5234 @ 9613

Ex Output:
21206


Ex Input:
7272 @ 8958 # 7231 @ 6616

Ex Output:
15615


Ex Input:
2228 @ 8676 @ 3947

Ex Output:

14851