use std::io::{self, BufRead};

fn main() {
    io::stdin().lock().lines().for_each(|l| {
        let input = l
            .unwrap()
            .split(' ')
            .map(|n| n.parse::<usize>().unwrap())
            .collect::<Vec<_>>();

        let mut power = 1;
        let mut answer = 0;

        while power < input[0] {
            power <<= 1;
            answer += 1;
        }

        println!("{}", answer);
    });
}