using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = int.Parse(line[0]);
        var b = int.Parse(line[1]);
        var c = int.Parse(line[2]);
        getAns(a, b, c);
    }
    static void getAns(int a, int b, int c)
    {
        var ans = 1000;
        for (int i = 0; i <= a; i++)
            for (int j = 0; j <= b; j++)
            {
                var pay = i + 10 * j;
                if (pay >= 1)
                {
                    for (int k = 0; k <= pay - 1; k++)
                    {
                        var change = getChange(k);
                        var t = a + b - i - j + change;
                        if (t == c) ans = Min(ans, pay - k);
                    }
                }
            }
        if (ans == 1000) Console.WriteLine("Impossible");
        else Console.WriteLine(ans);
    }
    static int getChange(int a) => a - a / 10 * 9;
}