fn dfs(x: usize, y: usize, h: usize, depth: usize, result: &mut usize) {
    if x <= h && y <= h {
        *result = (*result).max(depth);
        return;
    }
    if x > h {
        dfs(x / 2, y, h * 2, depth+1, result);
    }
    if y > h {
        dfs(x, y / 2, h * 2, depth+1, result);
    }
}

fn main() {
    let mut xyh = String::new();
    std::io::stdin().read_line(&mut xyh).ok();
    let xyh: Vec<usize> = xyh.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let x = xyh[0] * 1000;
    let y = xyh[1] * 1000;
    let h = xyh[2];

    let mut result = 0usize;
    dfs(x, y, h, 0, &mut result);
    println!("{}", result);
}