/* https://yukicoder.me/problems/89 */
use std::io;

fn calc(n: u32, c: u32) -> u32{
    if n == 0 {
        c
    } else if n % 2 == 0 {
        calc(n / 2, c + 1)
    } else {
        calc((n - 1) / 2, c + 1)
    }
}

fn main() {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    let n: u32 = input.trim().parse().unwrap();
    let c = calc(n, 0);
    println!("{:?}", c);
}