using System;
using System.Collections.Generic;
using System.Text;

namespace yukicoder_contest_312
{
    class _2_2
    {
        static void Main (string[] args)
        {
            long n = long.Parse(Console.ReadLine());
            long output = n;

            for (int k = 1; k <= n; k++)
            {
                for (int j = 0; j <= n - k; j++)
                {
                    for (int i = 0; i <= n - k - j; i++)
                    {
                        int pow = (int)Math.Pow(i, j) + k;
                        if (pow == n)
                        {
                            if (output >= i + j + k) output = i + j + k;
                        }
                    }
                }
            }
            Console.WriteLine(output);
        }
    }
}