using System;

public class Hello
{
    public static void Main()
    {
        var c = getC();
        var n = int.Parse(Console.ReadLine().Trim());
        if (n == 1) { Console.WriteLine(1); goto end; }
        var a = getP(c, n);
        if (c[a] == n) { Console.WriteLine(1); goto end; }
        var cL = c.Length;
        for (int i = 0; i <= a; i++)
            for (int j = 0; j <= a; j++)
                if (c[i] + c[j] == n) { Console.WriteLine(2); goto end; }
        Console.WriteLine(3);
        end:;
    }
    public static int[] getC()
    {
        var c = new int[4471];
        for (int i = 1; i <= 4471; i++)
            c[i - 1] = i * (i + 1) / 2;
        return c;
    }
    public static int getP(int[] c, int n)
    {
        var ng = 0; var ok = c.Length - 1;
        while (ok - ng > 1)
        {
            var mid = ng + (ok - ng) / 2;
            if (c[mid] >= n) ok = mid;
            else ng = mid;
        }
        return ok;
    }
}