using System;
using static System.Console;
using static System.Math;
using System.Linq;

public class Hello{
    public static void Main(){
        string[] inp = ReadLine().Split(' ');
        int a = int.Parse(inp[0]);
        int b = int.Parse(inp[1]);
        int c = int.Parse(inp[2]);
        int d = int.Parse(inp[3]);
        if(d>=10){
            WriteLine("Impossible");
        }else{
            int bairitu = 1;
            int count = 0;
            int total = 0;
            while(b>0){
                count++;
                total += 50*bairitu;
                b--;
                if(count % 100 ==0){
                    bairitu*=2;
                }
            }
            while(a>0){
                count++;
                total += 100*bairitu;
                a--;
                if(count%100 == 0){
                    bairitu*=2;
                }
//                WriteLine(total);
            }
            WriteLine("Possible");
            WriteLine(total);
        }
    }
}