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:
6628 @ 7709 @ 528 @ 8813

Ex Output:
23678


Ex Input:
1917 @ 4353 @ 4321 @ 3060 @ 6681 @ 7890 @ 8148

Ex Output:
36370


Ex Input:
3229 @ 3176 # 8009 @ 6079 # 8090 @ 5706 # 3416

Ex Output:

-1325