using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        var n = long.Parse(Console.ReadLine().Trim());
        getAns(n);
    }
    static void getAns(long n)
    {
        var ans = n + 1;
        var imax = (int)(Log10(n) / Log(2));
        for (int j = 2; j <= imax; j++)
        {
            var i = (int)Pow(n, 1d / j);
            var k = n - (long)Pow(i, j);
            ans = Min(ans, i + j + k);
        }
        Console.WriteLine(ans);
    }
}