using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;class Program
{
	
	static void Main(string[] args)
	{
        //var exStdIn = new System.IO.StreamReader( "stdin.txt" );System.Console.SetIn( exStdIn );
		const long inf = 100000000000000;
		long a = int.Parse(Console.ReadLine());
		long tmp = a;
		long ans = inf;
		long cnt = 0;
		while(tmp>0){
			tmp/=2;
			cnt++;
		}
		ans = cnt*2;
		tmp = a;
		cnt = 0;
		while(tmp>0){
			tmp/=3;
			cnt++;
		}
		ans = Min(ans, cnt*3);
		Console.WriteLine(ans);
	}
}