using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static char[][] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine().ToCharArray()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var a = new List<int>();
        for (var i = 0; (i + 1) * (i + 2) / 2 <= n; ++i) a.Add((i + 1) * (i + 2) / 2);
        if (a[^1] == n)
        {
            WriteLine(1);
            return;
        }
        for (var i = 0; i < a.Count; ++i) for (var j = i; j < a.Count; ++j)
        {
            if (a[i] + a[j] == n)
            {
                WriteLine(2);
                return;
            }
        }
        WriteLine(3);
    }
}