fn main() {
    let mut nm = String::new();
    std::io::stdin().read_line(&mut nm).ok();
    let nm: Vec<usize> = nm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nm[0];
    let m = nm[1];

    if m == 0 {
        if n <= 2 {
            println!("Impossible");
        } else {
            println!("Possible");
        }
    } else if m > 1 {
        if vec![(2, 2), (3, 2), (3, 3), (4, 3)].contains(&(n, m)) {
            println!("Impossible");
        } else {
            println!("Possible");
        }
    } else {
        println!("Possible");
    }
}