using System;
using System.Linq;

public class Program
{

    public static void Main(string[] args)
    {
        var result = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
        int perfect = result[0];
        int great = result[1];
        int good = result[2];
        int miss = result[3];

        var score = 0;
        var p = 1;
        var cnt = 0;
        if (miss >= 10) { Console.WriteLine("Impossible"); return; }

        for (var i=0; i < great; i++)
        {
            score += 50 * p;
            cnt++;
            if (cnt % 100 == 0) p *= 2;
        }
        for (var i = 0; i < perfect; i++)
        {
            score += 100 * p;
            cnt++;
            if (cnt % 100 == 0) p *= 2;
        }
        Console.WriteLine("Possible\n{0}", score);
    }
}