use std::cmp::{max, min};

fn gcd(a: usize, b: usize) -> usize {
    if a % b == 0 { return b; }
    gcd(b, a % b)
}

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let a = n;
    let b = n * (n + 1) / 2;
    println!("{}", gcd(max(a, b), min(a, b)));
}