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:
8137 @ 5006 # 7743 @ 1478

Ex Output:
6878


Ex Input:
7178 # 2086 # 1606 @ 4624 @ 4559 # 4855

Ex Output:
7814


Ex Input:
5877 # 1045 @ 4929 @ 6307 @ 7719 @ 9320 @ 8296 @ 3598 # 4524

Ex Output:

40477