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:
9039 @ 4996 @ 845 # 5409

Ex Output:
9471


Ex Input:
7272 @ 8958 # 7231 @ 6616

Ex Output:
15615


Ex Input:
6841 @ 9349 # 3429 # 2404 @ 2869 @ 6921

Ex Output:

20147


