using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        var n = long.Parse(Console.ReadLine().Trim());
        if (n <= 3) Console.WriteLine(n);
        else getAns(n);
    }
    static long Pow(int a, int b, long n)
    {
        var res = 1L;
        for (int i = 0; i < b; i++) res *= a;
        return res <= n ? res : -1;
    }
    static void getAns(long n)
    {
        var ans = n + 1;
        var jmax = (int)(Log10(n) / Log10(2));
        for (int j = 2; j <= jmax; j++)
        {
            var i = (int)Math.Pow(n, 1d / j);
            var a = Pow(i, j, n);
            var a2 = Pow(i + 1, j, n);
            long k;
            if (a2 == -1) k = n - a;
            else { k = n - a2; i++; }
            if (k >= 0) ans = Min(ans, i + j + k);
        }
        Console.WriteLine(ans);
    }
}