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Set a state, based on the value of multiple inputs

hi everyone, I am facing a problem.
I have these 4 inputs, which only accept numbers and I would like to set a state based on the value of these 4 inputs.
Example .
if the first input has a value of 13, the second 15, the third 18 and the fourth 30, I would like my final status to be: 13151830. However, when I try to set the state and assign it multiple values ​​this is not an option. is there any way to fix this? Or deal with it differently?

I found the solution …: append, thanks anyway to everyone