use std::io::{self, BufRead};

fn main() {
    let input = io::stdin()
        .lock()
        .lines()
        .map(std::result::Result::unwrap)
        .collect::<Vec<_>>();

    let n = input[0].parse::<usize>().unwrap();
    println!("{}{}", "7".repeat(n % 2), "1".repeat(n / 2 - n % 2));
}