using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;
using static System.Convert;
using static System.Math;
//using Debug;
//using static System.Globalization.CultureInfo;
using System.Text;
class Program
{
    static void Main(string[] args)
    {
        Solve();
        //WriteLine(Solve());
    }
    static void Solve()
    {
        var abc = Input.ar;
        if (abc[0] + abc[1] <= abc[2]) { WriteLine("Impossible");return; }
        var val = abc[0] + 10 * abc[1];
        var e = new List<int>() { val };
        for (var i = 0; i < abc[0]; i++)
            e.Add(val - i - 1);var c = e.Count;
        for (var i = 0; i < c; i++)
            for (var j = 0; j < abc[1]; j++)
                e.Add(e[i] - 10 * (j + 1));
        e = e.OrderByDescending(v => v).ToList();
        for(var i = 0; i <e.Count; i++)
        {
            for(var j=0;j<=abc[2];j++)
            {
                if (j + 10 * (abc[2] - j) == e[i]&&val-e[i]!=0) { WriteLine(val - e[i]);return; }
            }
        }
        WriteLine("Impossible");
    }
}

public class Input
{
    public static string read => ReadLine();
    public  static int[] ar => Array.ConvertAll(read.Split(' '), int.Parse);
    public  static int num => ToInt32(read);
    public static long[] arL => Array.ConvertAll(read.Split(' '), long.Parse);
    public  static long numL => ToInt64(read);
    public static char[][] gred(int h) 
        => Enumerable.Repeat(0, h).Select(v => read.ToCharArray()).ToArray();
    public static int[][] ar2D(int num)
        => Enumerable.Repeat(0, num).Select(_ => ar).ToArray();
    public static long[][] arL2D(int num)
        => Enumerable.Repeat(0, num).Select(_ => arL).ToArray();
    public static T getValue<T>(string g)
    {
        var t = typeof(T);
        if (t == typeof(int))
            return (T)(object)int.Parse(g);
        if (t == typeof(long))
            return (T)(object)long.Parse(g);
        if (t == typeof(string))
            return (T)(object)g;
        if (t == typeof(char))
            return (T)(object)char.Parse(g);
        if (t == typeof(double))
            return (T)(object)double.Parse(g);
        if (t == typeof(bool))
            return (T)(object)bool.Parse(g);
        return default(T);
    }
    public const long Inf = (long)1e18;
    public const double eps = 1e-6;
    public  const string alfa = "abcdefghijklmnopqrstuvwxyz";
    public  const int MOD = 1000000007;
}