use std::collections::HashSet;

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

	let mut t: Vec<usize> = vec![1];
	
	for i in 2.. {
		if i < n { t.push(t[i - 2] + i); }
		else { break; }
	}

	let set: HashSet<usize> = t.iter().cloned().collect();

	let mut ans = 3;
	if set.contains(&n) {
		println!("{}", 1);
		return;
	}

	for i in 0..set.len() {
		if set.contains(&(n - t[i])) {
			ans = 2;
		}
		if i > n / 2 { break; }
	}

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