use std::collections::{HashSet, VecDeque};

fn main() {
    let mut xyh: String = String::new();
    std::io::stdin().read_line(&mut xyh).ok();
    let xyh: Vec<usize> = xyh.trim().split_whitespace().map(|i| i.parse().unwrap()).collect();
    let x: u128 = xyh[0] as u128 * 1000;
    let y: u128 = xyh[1] as u128 * 1000;
    let h = xyh[2];
    let mut cands: VecDeque<(u128, u128, usize, usize)> = VecDeque::new();
    let mut used: HashSet<(u128, u128, usize, usize)> = HashSet::new();
    let mut target: (u128, u128, usize, usize) = (x, y, h, 0);
    cands.push_back(target);
    used.insert(target);
    while cands.len() > 0 {
        target = cands.pop_front().unwrap();
        if target.0 > target.2 as u128 {
            let next: (u128, u128, usize, usize) = (target.0 / 2, target.1, target.2 * 2, target.3+1);
            if !cands.contains(&next) {
                cands.push_back(next);
                used.insert(next);
            }
        }
        if target.1 > target.2 as u128 {
            let next: (u128, u128, usize, usize) = (target.0, target.1 / 2, target.2 * 2, target.3+1);
            if !cands.contains(&next) {
                cands.push_back(next);
                used.insert(next);
            }
        }
    }
    println!("{}", target.3);
}