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);
        getAns(n);
    }
    static void getAns(long n)
    {
        var ans = n + 1;
        var jmax = (int)(Log10(n) / Log10(2));
        for (long i = 2; i * i <= n; i++)
        {
            var p = 0;
            var x = 1L;
            while (p < jmax)
            {
                if (x * i > n) break;
                x *= i;
                p++;
            }
            var k = n - x;
            if (k >= 0) ans = Min(ans, i + p + k);
        }
        Console.WriteLine(ans);
    }
}