Elementary arithmetic in search criterias

[roobsx]

Is possible use arithmetic here:

I want something like that: 3 + {-Variable.Modifier-}
There is alwas 3 but sometimes must be add 1 or -1 etc.

 

[lokiys]

yes you can use variable in this field.
Setup variable 3 as default value and when you need + 1 then increase variable and when -1 then decrease.