import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double x = sc.nextInt() * 1000.0;
        double y = sc.nextInt() * 1000.0;
        double h = sc.nextInt();
        int count = 0;
        while (x > h || y > h) {
            count++;
            if (x > h && (y <= h || x <= y)) {
                x /= 2;
                h *= 2;
            } else {
                y /= 2;
                h *= 2;
            }
        }
        System.out.println(count);
    }
}