fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let mut n: u32 = n.trim().parse().unwrap();

    if n == 0 {
        println!("0");
    } else {
        let mut digits = vec![];
        while n > 0 {
            digits.push(n % 7);
            n /= 7;
        }
        digits.reverse();

        let answer: String = digits
            .iter()
            .map(|&n| char::from_digit(n, 10).unwrap())
            .collect();

        println!("{}", answer);
    }
}