using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text;

public class Program
{

    public void Proc()
    {
        int[] inpt = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();
        this.Target = inpt[1];

        decimal[] items = new decimal[inpt[0]];
        for (int i = 1; i <= inpt[0]; i++) {
            items[i - 1] = i;
        }
        string ans = "Impossible";
        if(CanCreate(items)) {
            ans = "Possible";
        }
        Console.WriteLine(ans);
    }

    private Dictionary<string, bool> dic = new Dictionary<string, bool>();
    private decimal Target = 0;
    private bool CanCreate(decimal[] items) {
        string key = string.Join("#", items);
        if(items.Length == 1) {
            return items[0] == Target;
        } 
        if(dic.ContainsKey(key)) {
            return dic[key];
        }
        bool ans = false;
        for (int i = 0; i < items.Length-1; i++) {
            for (int j = i + 1; j < items.Length; j++) {
                List<decimal> subItems = new List<decimal>();
                subItems.AddRange(items);
                subItems.RemoveAt(j);
                subItems.RemoveAt(i);
                List<decimal> newItems = new List<decimal>();
                newItems.Add(items[i]+items[j]);
                newItems.Add(items[i]-items[j]);
                newItems.Add(items[j]-items[i]);
                newItems.Add(items[i]*items[j]);
                if(items[i]!=0) {
					newItems.Add(items[j] / items[i]);
				}
                if(items[j]!=0) {
					newItems.Add(items[i] / items[j]);
				}
                foreach(decimal addItem in newItems) {
                    List<decimal> tmp = new List<decimal>();
                    tmp.AddRange(subItems);
                    tmp.Add(addItem);
                    if(CanCreate(tmp.OrderBy(a=>a).ToArray())) {
                        ans = true;
                        break;
                    }
                }
                if(ans) {
                    break;
                }
			}
            if(ans) {
                break;
            }
        }
        dic[key] = ans;
        return ans;
    }


    public class Reader
	{
		private static StringReader sr;
		public static bool IsDebug = false;
		public static string ReadLine()
		{
			if (IsDebug)
			{
				if (sr == null)
				{
					sr = new StringReader(InputText.Trim());
				}
				return sr.ReadLine();
			}
			else
			{
				return Console.ReadLine();
			}
		}
		private static string InputText = @"



10 1








";
	}

	public static void Main(string[] args)
	{
#if DEBUG
		Reader.IsDebug = true;
#endif
		Program prg = new Program();
		prg.Proc();
	}
}