use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();

    // gcd(n, n * (n - 1) / 2)
    let mut m = if n % 2 == 0 { n / 2 } else { n };
    let mut i = 2;
    let mut ans = 1;
    while i * i <= m {
        let mut mul = i;
        while m % i == 0 {
            m /= i;
            mul *= i;
        }
        ans *= (mul - 1) / (i - 1);
        i += 1;
    }
    if m != 1 {
        ans *= 1 + m;
    }
    println!("{}", ans);
}