fn main() {
    let mut xx = String::new();
    std::io::stdin().read_line(&mut xx).ok();
    let xx: Vec<u64> = xx.split_whitespace().flat_map(str::parse).collect();

    let (mut x, mut y, mut h) = (1000 * xx[0], 1000 * xx[1], xx[2]);

    let mut n = 0;
    while x > h || y > h {
        if x > h && y > h {
            if x < y {
                y *= 2;
            } else {
                x *= 2;
            }
        } else if x > h {
            y *= 2;
        } else {
            x *= 2;
        }
        h *= 4;
        n += 1;
    }

    println!("{n}");
}