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:
2269 # 7857 @ 1906 @ 1098 # 6308 # 1142 @ 2063

Ex Output:
-7971


Ex Input:
7757 # 4475 @ 6447 # 2209 # 9966

Ex Output:
-2446


Ex Input:
774 @ 2679 @ 5633 @ 2371 @ 9962

Ex Output:

21419