Problem:
Score : 300 points

Problem Statement

As a token of his gratitude, Takahashi has decided to give his mother an integer sequence.
The sequence A needs to satisfy the conditions below:

A consists of integers between X and Y (inclusive).

For each 1\leq i \leq |A|-1, A_{i+1} is a multiple of A_i and strictly greater than A_i.

Find the maximum possible length of the sequence.

Constraints

1 \leq X \leq Y \leq 10^{18}

All input values are integers.

Input

Input is given from Standard Input in the following format:

X Y

Output

Print the maximum possible length of the sequence.

Sample Input 1

3 20

Sample Output 1

3

The sequence 3,6,18 satisfies the conditions.

Sample Input 2

25 100

Sample Output 2

3

Sample Input 3

314159265 358979323846264338

Sample Output 3

31

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Numerics;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            var w = Console.ReadLine().Split(' ').ToArray();

            BigInteger x = BigInteger.Parse(w[0]);
            BigInteger y = BigInteger.Parse(w[1]);

            BigInteger z = y / x;
            var p = Math.Floor(BigInteger.Log(z, 10));
            int temp = 3 * int.Parse(p.ToString());
            int i;
            for (i = temp; i <= temp + 4; i++)
            { 
                if(x * BigInteger.Pow(2,i) > y)
                {
                    i = i - 1;
                    break;
                }
            }

            Console.WriteLine(i + 1);

        }
    }
}