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

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        if (c[3] >= 10)
        {
            WriteLine("Impossible");
            return;
        }
        var ans = 0L;
        var cmb = 0;
        var mul = 1L;
        while (c[1] > 0)
        {
            ans += 50 * mul;
            ++cmb;
            if (cmb % 100 == 0) mul <<= 1;
            --c[1];
        }
        while (c[0] > 0)
        {
            ans += 100 * mul;
            ++cmb;
            if (cmb % 100 == 0) mul <<= 1;
            --c[0];
        }
        WriteLine("Possible");
        WriteLine(ans);
    }
}