using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Xml.Schema;

namespace Contest
{
    class Scanner
    {
        private string[] line = new string[0];
        private int index = 0;
        public string Next()
        {
            if (line.Length <= index)
            {
                line = Console.ReadLine().Split(' ');
                index = 0;
            }
            var res = line[index];
            index++;
            return res;
        }
        public int NextInt()
        {
            return int.Parse(Next());
        }
        public long NextLong()
        {
            return long.Parse(Next());
        }
        public ulong NextUlong()
        {
            return ulong.Parse(Next());
        }
        public string[] Array()
        {
            line = Console.ReadLine().Split(' ');
            index = line.Length;
            return line;
        }
        public int[] IntArray()
        {
            var array = Array();
            var result = new int[array.Length];
            for (int i = 0; i < array.Length; i++)
            {
                result[i] = int.Parse(array[i]);
            }

            return result;
        }
        public long[] LongArray()
        {
            var array = Array();
            var result = new long[array.Length];
            for (int i = 0; i < array.Length; i++)
            {
                result[i] = long.Parse(array[i]);
            }

            return result;
        }
    }

    class Program
    {
        private int A, B, C, D;
        private void Scan()
        {
            var sc = new Scanner();
            A = sc.NextInt();
            B = sc.NextInt();
            C = sc.NextInt();
            D = sc.NextInt();
        }

        public void Solve()
        {
            Scan();
            long ans = 0;
            int cnt = 0;
            if (D >= 10)
            {
                Console.WriteLine("Impossible");
                return;
            }
            for (int i = 0; i < B; i++)
            {


                int d = cnt / 100;
                ans += (1 << d) * 50;
                cnt++;
            }

            for (int i = 0; i < A; i++)
            {

                int d = cnt / 100;
                ans += (1 << d) * 100;
                cnt++;

            }
            Console.WriteLine("Possible");
            Console.WriteLine(ans);
        }

        static void Main() => new Program().Solve();
    }

}