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:
8041 @ 762 @ 8091 @ 6500

Ex Output:
23394


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

Ex Output:
29471


Ex Input:
1168 @ 2498 @ 7324 @ 4040 @ 319

Ex Output:

15349