use std::io;

fn main() {
    let mut input = String::new();

    io::stdin().read_line(&mut input).unwrap();

    let mut n : u32 = input.trim().parse().unwrap();

    let digits = n / 2;

    n = n - digits * 2;

    print!("{}", if n == 0 {1} else {7});

    for _ in 0..digits-1 {
        print!("1");
    }

    print!("\n");
}