using System;

public class Hello
{
    public static int a, b, c, d;
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        a = int.Parse(line[0]);
        b = int.Parse(line[1]);
        c = int.Parse(line[2]);
        d = int.Parse(line[3]);
        getAns();
    }
    static void getAns()
    {
        if (d == 10) { Console.WriteLine("Impossible"); return; }
        Console.WriteLine("Possible");
        var c = 0;
        var p = 1;
        while (true)
        {
            if (b >= 100)
            {
                b -= 100;
                c += p * 50 * 100;
                p *= 2;
            }
            else
            {
                if (a + b >= 100)
                {
                    c += p * 50 * b + p * 100 * (100 - b);
                    a -= 100 - b;
                    b = 0;
                    p *= 2;
                }
                else
                {
                    c += p * 50 * b + p * 100 * a;
                    break;
                }
            }
        }
        Console.WriteLine(c);
    }
}