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 static System.Console;
class Program
{
    static void Main()
    {
        string input = ReadLine();
        string[] a = input.Split(' ');
        ulong[] b = new ulong[a.Length];
        for (int i = 0; i < 2; i++){
            b[i] = ulong.Parse(a[i]);
        }
        ulong devided = b[1] / b[0];
        double c = Math.Log(devided, 2);
        ulong result = 0;
        ulong d = 1;
        while(result < c){
            result += d;
            d *= 2;
        }
        WriteLine(result.ToString());
    }
}