fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let n: u32 = s
		.split_whitespace()
		.map(|s| s.chars().last().unwrap().to_digit(10).unwrap() % 2)
		.sum();
	println!("{}", if n == 1 { "Impossible" } else { "Possible" })
}