Scanf.scanf "%d %d %d" (fun a b c ->
    let calc rest cost =
        let rec loop i =
            if i > cost then max_int else
                let r2 = rest + (cost - i) / 10 + (cost - i) mod 10 in
                if r2 = c then i else loop (i + 1)
        in
        loop 1
    in
    let rec loop_i i acc =
        let rec loop_j j acc =
            if j > a then acc else
                let rest = calc (b - i + a - j) (i * 10 + j) in
                loop_j (j + 1) (min acc rest)
        in
        if i > b then acc else
            loop_i (i + 1) (loop_j 0 acc)
    in
    let ans = loop_i 0 max_int in
    if ans = max_int then print_endline "Impossible" else Printf.printf "%d\n" ans
)