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 Rust (1.15.1) (judge verdict: Wrong Answer)

use std::io;

fn read_line() -> String {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    s
}

macro_rules! from_line {
    ($($a:ident : $t:ty),+) => {
        $(let $a: $t;)+
        {
            let _line = read_line();
            let mut _it = _line.trim().split_whitespace();
            $($a = _it.next().unwrap().parse().unwrap();)+
                assert!(_it.next().is_none());
        }
    };
}

fn digit_sum(n: i64) -> i64 {
    let mut sum = 0;
    let mut tmp_n = n;

    loop {
        sum += tmp_n % 10;
        tmp_n = tmp_n / 10;

        if tmp_n == 0 {
            break;
        }
    }
    sum
}

fn seq_ln(start: i64, end: i64) -> i64 {
    let mut tmp = start;
    let mut count = 0;
    while tmp <= end && count < start {
        count += 1;
        tmp *= 2;
    }
    count
}

fn main() {
    from_line!(x: i64, y: i64);
    let mut max = 0;
    println!("{}", seq_ln(x, y));
    // for i in x..2*x {
    //     let length = seq_ln(i, y);
    //     println!("i:{} ln:{}", i, length);
    //     if max < length {
    //         max = length;
    //     }
    // }
    // println!("{}", max);
}