using System.Collections.Generic;
using System.Linq;
using static System.Console;

class Program {
    static void Main() {
        var score = 0;
        var bonus = 1;

        var pf = NextInt();
        var gt = NextInt();
        var gd = NextInt();
        var ms = NextInt();

        if (ms >= 10) {
            WriteLine("Impossible");
            return;
        }
        foreach (var i in Enumerable.Range(1, int.MaxValue)) {
            if (gt == 0 && pf == 0) {
                break;
            } else if (gt != 0) {
                score += 50 * bonus;
                gt--;
            } else if (pf != 0) {
                score += 100 * bonus;
                pf--;
            }
            if (i % 100 == 0) {
                bonus *= 2;
            }
        }
        WriteLine("Possible\n" + score.ToString());
    }

    static int NextInt() {
        return int.Parse(NextString());
    }

    static string NextString() {
        var result = new List<char>();
        while (true) {
            int next = Read();
            if (next < 0)
                break;
            var nextChar = (char)next;
            if (!char.IsWhiteSpace(nextChar))
                result.Add(nextChar);
            else if (nextChar != '\r')
                break;
        }
        return string.Join("", result);
    }
}