use std::io::*;
use std::str::FromStr;

fn main() {
    exec(read());
}


fn exec(i: i64) {
    matching(i)
}

fn matching(i: i64) {
    let mut s: String = String::from("");
    if i % 2 == 1 {
        for _ in 0..((i - 3) / 2) {
            s.push_str("1");
        }
        println!("{}{}", s, 7);
    } else {
        for _ in 0..(i / 2) {
            s.push_str("1");
        }
        println!("{}", s);
    }
}

fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}