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:
2339 @ 2821 # 2234 @ 1271 @ 471

Ex Output:
4668


Ex Input:
1614 # 4521 @ 7508 # 7726 @ 6176 @ 8975 # 693

Ex Output:
11333


Ex Input:
2950 # 1938 @ 5150 # 9113 @ 7821 # 8191 # 9748

Ex Output:

-13069