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:
6942 @ 1857 @ 1508 @ 3059 # 6727

Ex Output:
6639


Ex Input:
6853 # 3523 @ 1895 @ 6916 @ 2795 # 8802 # 3074 # 5622 @ 956

Ex Output:
-1606


Ex Input:
9886 @ 3912 @ 2116 @ 1246 @ 1851 @ 4114 # 862 # 6407

Ex Output:

15856