using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Competitive
{
    internal class Solution
    {
        public int N, M;

        public void Run()
        {
            {
                var line = Input.ReadIntArray();
                N = line[0];
                M = line[1];
            }

            if ((M == 0 && N == 1) || (M == 0 && N == 2))
            {
                Console.WriteLine("Impossible");
            }
            else
            {
                Console.WriteLine("Possible");
            }
        }
    }

    // libs ----------
    
    // common ----------

    internal static class Input
    {
        public static int ReadInt()
        {
            string line = Console.ReadLine();
            return int.Parse(line);
        }

        public static int[] ReadIntArray()
        {
            string line = Console.ReadLine();
            return line.Split(' ').Select(int.Parse).ToArray();            
        }

        public static double[] ReadDoubleArray()
        {
            string line = Console.ReadLine();
            return line.Split(' ').Select(double.Parse).ToArray();
        }
    }
    
    internal class Program
    {
        public static void Main(string[] args)
        {
            var s = new Solution();
            s.Run();
        }
    }
}