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:
2404 @ 4359 # 5006 # 2796 # 6139

Ex Output:
-7178


Ex Input:
8238 @ 9817 # 2474 @ 3673 @ 9625 # 849 @ 1441

Ex Output:
29471


Ex Input:
248 @ 2276 @ 3243 @ 6687 # 3151 @ 988

Ex Output:

10291