import java.io.*;
import java.util.*;


public class Main_yukicoder634 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int n = sc.nextInt();

		Set<Integer> tr = new HashSet<>();
		for (int i = 1; i * (i + 1) / 2 <= n; i++) {
			int tmp = i * (i + 1) / 2;
			tr.add(tmp);
		}

		if (tr.contains(n)) {
			pr.println(1);
		} else {
			for (int e : tr) {
				if (tr.contains(n - e)) {
					pr.println(2);
					return;
				}
			}
			pr.println(3);
		}

	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}