import java.util.Scanner;
import java.util.HashSet;
import java.util.ArrayList;

public class Main {
    static int solve(int n) {
        HashSet<Integer> exists = new HashSet<>();

        ArrayList<Integer> ts = new ArrayList<>();
        for (int t, i = 1; (t = i * (i + 1) / 2) <= n; i++) {
            if (t == n) {
                return 1;
            }
            ts.add(t);
            exists.add(t);
        }

        for (int t : ts) {
            if (exists.contains(n - t)) {
                return 2;
            }
        }

        return 3;
    }

    public static void main(String... argv) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        System.out.println(solve(n));
    }
}