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

public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int[] coins = new int[5000];
        for (int i = 1; i < 5000; i++) {
            coins[i] = i * (i + 1) / 2;
            if (n == coins[i]) {
                System.out.println(1);
                return;
            }
        }
        int right = 4999;
        for (int i = 0; i <= right; i++) {
            while (coins[i] + coins[right - 1] > n) {
                right--;
            }
            if (coins[i] + coins[right - 1] == n) {
                System.out.println(2);
                return;
            }
        }
        System.out.println(3);
    }
}