using System;
using System.Collections.Generic;
using System.Linq;

public class P1010 {
    public static void Main() {
        var xyh = Console.ReadLine().Trim().Split(' ').Select(int.Parse).ToList();
        var x = xyh[0] * 1000.0;
        var y = xyh[1] * 1000.0;
        var h = xyh[2];
        var cands = new Queue<(double, double, int, int)>();
        var target = (x: x, y: y, h: h, count: 0);
        cands.Enqueue(target);
        while (cands.Count() > 0) {
            target = cands.Dequeue();
            if(target.x > target.h) {
                cands.Enqueue((target.x / 2, target.y, target.h * 2, target.count+1));
            }
            if(target.y > target.h) {
                cands.Enqueue((target.x, target.y / 2, target.h * 2, target.count+1));
            }
        }
        Console.WriteLine(target.count);
    }
}