#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import array
from bisect import *
from collections import *
import fractions
import heapq
from itertools import *
import math
import random
import re
import string
import sys

x, y, h = map(int, input().split())
x *= 1000
y *= 1000
ans = 0
while x > h or y > h:
    x, y = min(x, y), max(x, y)
    ans += 1
    if x > h:
        y *= 2
        h *= 4
    elif y > h:
        x *= 2
        h *= 4
    # print(x, y, h)
print(ans)