let tbl =
    "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    |> Seq.mapi (fun i c -> (c, int64 i))
    |> dict

let pow (b:int64) (e:int64) =
    let rec iter (c:int64) (acc:int64) =
        match c with
        | 0L -> acc
        | _ -> iter (c-1L) (acc*b)
    iter e 1L

let convert (s:string) =
    let a = s.ToCharArray() |> Array.rev
    let b = Seq.sort a |> Seq.last |> fun c -> tbl.Item(c) + 1L

    a
    |> Seq.mapi (fun i c -> tbl.Item(c) * (pow b (int64 i)))
    |> Seq.sum

let iter n =
    seq { for _ in 1..n -> stdin.ReadLine () }
    |> Seq.map convert

let calc = int >> iter >> Seq.sort >> Seq.head

stdin.ReadLine () |> calc |> printfn "%d"