fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let n: u32 = s.trim().parse().unwrap();
	let mut s = String::from(if n % 2 == 0 { "1" } else { "7" });
	(0..n / 2 - 1).for_each(|_| s.push('1'));
	println!("{}", s);
}