#![allow(unused_imports)]
#![allow(unused_macros)]
#![allow(dead_code)]
#![allow(non_snake_case)]

pub use __cargo_equip::prelude::*;

use kyopro_io::get;
use std::io::{Write, StdoutLock};

const MULTIPLE_TEST_CASE: bool = false;
fn _main(writer:&mut std::io::BufWriter<StdoutLock>) {
    let (n,m) = get!{i64,i64};
    let ans=if (n-m)%2==0{"Possible"}else{"Impossible"};
    writeln!(writer, "{}", ans).unwrap();
}

fn main() {
    let t = if MULTIPLE_TEST_CASE { get!(usize) } else { 1 };

    let stdout = std::io::stdout();
    let mut writer = std::io::BufWriter::new(stdout.lock());

    for _ in 0..t {
        _main(&mut writer);
    }
}

// The following code was expanded by `cargo-equip`.

///  # Bundled libraries
/// 
///  - `kyopro-io 0.1.0 (path+████████████████████████████████████████████████)` published in **missing** licensed under `CC0-1.0` as `crate::__cargo_equip::crates::kyopro_io`
#[cfg_attr(any(), rustfmt::skip)]
#[allow(unused)]
mod __cargo_equip {
    pub(crate) mod crates {
        pub mod kyopro_io {pub use crate::__cargo_equip::macros::kyopro_io::*;#[macro_export]macro_rules!__cargo_equip_macro_def_kyopro_io_get{($t:ty)=>{{let mut line:String=String::new();std::io::stdin().read_line(&mut line).unwrap();line.trim().parse::<$t>().unwrap()}};($($t:ty),*)=>{{let mut line:String=String::new();std::io::stdin().read_line(&mut line).unwrap();let mut iter=line.split_whitespace();($(iter.next().unwrap().parse::<$t>().unwrap(),)*)}};($t:ty;$n:expr)=>{(0..$n).map(|_|get!($t)).collect::<Vec<_>>()};($($t:ty),*;$n:expr)=>{(0..$n).map(|_|get!($($t),*)).collect::<Vec<_>>()};($t:ty;;)=>{{let mut line:String=String::new();std::io::stdin().read_line(&mut line).unwrap();line.split_whitespace().map(|t|t.parse::<$t>().unwrap()).collect::<Vec<_>>()}};($t:ty;;$n:expr)=>{(0..$n).map(|_|get!($t;;)).collect::<Vec<_>>()};}macro_rules!get{($($tt:tt)*)=>(crate::__cargo_equip_macro_def_kyopro_io_get!{$($tt)*})}}
    }

    pub(crate) mod macros {
        pub mod kyopro_io {pub use crate::__cargo_equip_macro_def_kyopro_io_get as get;}
    }

    pub(crate) mod prelude {pub use crate::__cargo_equip::crates::*;}

    mod preludes {
        pub mod kyopro_io {}
    }
}