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:
9407 @ 4324 # 2220 # 8668 @ 1606 @ 4059

Ex Output:
8508


Ex Input:
5986 # 3224 # 3957 @ 1893 @ 9453 @ 3954 # 476 # 5750 # 5163

Ex Output:
2716


Ex Input:
3413 # 3340 # 6152 # 2564 @ 7375 @ 8131 @ 6397

Ex Output:

13260