import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int k = sc.nextInt();
        if (k == 0 && n < 3) {
            System.out.println("Impossible");
       } else {
           System.out.println("Possible");
       }
    }
}