using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Program
{
    static void Main()
    {
        new Magatro().Solve();
    }
}

class Magatro
{
    private int N;
    private int M;
    private const int Mod = (int)1e9 + 7;

    public void Solve()
    {
        var line = Console.ReadLine().Split(' ');
        N = int.Parse(line[0]);
        M = int.Parse(line[1]);
        if (M == 0 && (N == 1 || N == 2))
        {
            Console.WriteLine("Impossible");
        }
        else
        {
            Console.WriteLine("Possible");
        }
    }
}