using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        var n = long.Parse(Console.ReadLine().Trim());
        if (n <= 2) Console.WriteLine(n);
        else getAns(n);
    }
    static void getAns(long n)
    {
        var ans = n + 1;
        var imax = (int)(Log10(n) / Log10(2));
        for (int j = 2; j <= imax; j++)
        {
            var i = (int)Pow(n, 1d / j);
            var x = 1L;
            for (int a = 0; a < j; a++) x *= i;
            var k = n - x;
            ans = Min(ans, i + j + k);
        }
        Console.WriteLine(ans);
    }
}