fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let n: u64 = s.trim().parse().unwrap();
    let cond = |p: u64| -> bool {
        if p <= 1 {
            return false;
        }
        let v = n % p;
        let mut n = n;
        while n > 0 {
            if n % p != v {
                return false;
            }
            n /= p;
        }
        true
    };
    let mut ans = n + 1;
    for p in (1..).take_while(|p| p * p <= n) {
        if cond(p) {
            ans = ans.min(p);
        }
        if n % p == 0 {
            let p = n / p - 1;
            if cond(p) {
                ans = ans.min(p);
            }
        }
    }
    println!("{}", ans);
}