fn getline() -> String{
        let mut __ret=String::new();
        std::io::stdin().read_line(&mut __ret).ok();
        return __ret;
}

fn main(){
        let mut num:i64 = getline().trim().parse().unwrap();
        if num % 2 == 1 {
                num -= 3;
                print!("7");
        }
        while num != 0 {
                print!("1");
                num -= 2;
        }
        println!("");
}