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:
1070 @ 5674 @ 50 # 2252

Ex Output:
4542


Ex Input:
427 # 7974 # 7564 @ 2404 # 4955 # 1239 # 1518 @ 906

Ex Output:
-19513


Ex Input:
8905 @ 4340 @ 8432 @ 6064 # 9206 # 2658

Ex Output:

15877