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:
1327 # 8233 # 8048 # 194 @ 2192 @ 1877 # 3427 # 3364 # 6008

Ex Output:
-23878


Ex Input:
8198 @ 1518 @ 1568 # 6805

Ex Output:

4479