import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int M = sc.nextInt();
    String ans = "Possible";
    if(N == 1) {
      if(M == 0) ans = "Impossible";
    }
    if(N == 2) {
      if(M == 0) ans = "Impossible";
    }
    System.out.println(ans);
  }
}