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;
        if (miss >= 10) { Console.WriteLine("Impossible"); return; }

        for (int i = 1; i <= great; i++)
        {
            if (1 <= i && i <= 100) score += 50;
            else if (101 <= i && i <= 200) score += 100;
            else if (201 <= i && i <= 300) score += 200;
            else if (301 <= i && i <= 400) score += 400;
        }
        for (int i = 1; i <= perfect; i++)
        {
            if (1 <= i && i <= 100) score += 100;
            else if (101 <= i && i <= 200) score += 200;
            else if (201 <= i && i <= 300) score += 400;
            else if (301 <= i && i <= 400) score += 800;
        }
        Console.WriteLine("Possible\n{0}",score);
    }
}